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•  contract AcceptsExchange
•    - function AcceptsExchange(address _tok ...
•    - function tokenFallback(address _from, ...
•  contract Exchange *
•    - function Exchange()
•    - function buy(address _referredBy)
•    - function payFund()
•    - function reinvest()
•    - function exit()
•    - function withdraw()
•    - function sell(uint256 _amountOfTokens ...
•    - function transfer(address _toAddress, ...
•    - function transferAndCall(address _to, ...
•    - function isContract(address _addr)
•    - function setBondFundAddress(address _ ...
•    - function setAltFundAddress(address _n ...
•    - function setFeeRates(uint8 _newDivRat ...
•    - function setAdministrator(address _id ...
•    - function setStakingRequirement(uint25 ...
•    - function setCanAcceptTokens(address _ ...
•    - function setName(string _name)
•    - function setSymbol(string _symbol)
•    - function totalEthereumBalance()
•    - function totalSupply()
•    - function myTokens()
•    - function myDividends(bool _includeRef ...
•    - function balanceOf(address _customerA ...
•    - function dividendsOf(address _custome ...
•    - function sellPrice()
•    - function buyPrice()
•    - function calculateTokensReceived(uint ...
•    - function calculateEthereumReceived(ui ...
•    - function etherToSendFund()
•    - function purchaseInternal(uint256 _in ...
•    - function handleRef(address _ref, uint ...
•    - function purchaseTokens(uint256 _inco ...
•    - function ethereumToTokens_(uint256 _e ...
•    - function tokensToEthereum_(uint256 _t ...
•    - function sqrt(uint x)
• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)

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/**
 *Submitted for verification at Etherscan.io on 2018-09-16
*/

pragma solidity ^0.4.21;

/*
* Wall Street Market presents......

 _       __      ____   _____ __                 __     ______          __                         
| |     / /___ _/ / /  / ___// /_________  ___  / /_   / ____/  _______/ /_  ____ _____  ____ ____ 
| | /| / / __ `/ / /   \__ \/ __/ ___/ _ \/ _ \/ __/  / __/ | |/_/ ___/ __ \/ __ `/ __ \/ __ `/ _ \
| |/ |/ / /_/ / / /   ___/ / /_/ /  /  __/  __/ /_   / /____>  </ /__/ / / / /_/ / / / / /_/ /  __/
|__/|__/\__,_/_/_/   /____/\__/_/   \___/\___/\__/  /_____/_/|_|\___/_/ /_/\__,_/_/ /_/\__, /\___/ 
                                                                                      /____/       


website:    https://wallstreetmarket.tk

discord:    https://discord.gg/8AFP9gS

25% Dividends Fees/Payouts

5% of Buy In Fee Goes into the Bond Market Contract for Distribution to Bond holders

Referral Program pays out 33% of Buy-in/Sell Fees to user of masternode link

*/





contract AcceptsExchange {
    Exchange public tokenContract;

    function AcceptsExchange(address _tokenContract) public {
        tokenContract = Exchange(_tokenContract);
    }

    modifier onlyTokenContract {
        require(msg.sender == address(tokenContract));
        _;
    }

    /**
    * @dev Standard ERC677 function that will handle incoming token transfers.
    *
    * @param _from  Token sender address.
    * @param _value Amount of tokens.
    * @param _data  Transaction metadata.
    */
    function tokenFallback(address _from, uint256 _value, bytes _data) external returns (bool);
}


contract Exchange {
    /*=================================
    =            MODIFIERS            =
    =================================*/
    // only people with tokens
    modifier onlyBagholders() {
        require(myTokens() > 0);
        _;
    }

    // only people with profits
    modifier onlyStronghands() {
        require(myDividends(true) > 0);
        _;
    }

    modifier notContract() {
      require (msg.sender == tx.origin);
      _;
    }

    // administrators can:
    // -> change the name of the contract
    // -> change the name of the token
    // -> change the PoS difficulty (How many tokens it costs to hold a masternode, in case it gets crazy high later)
    // they CANNOT:
    // -> take funds
    // -> disable withdrawals
    // -> kill the contract
    // -> change the price of tokens
    modifier onlyAdministrator(){
        address _customerAddress = msg.sender;
        require(administrators[_customerAddress]);
        _;
    }

 
    /*==============================
    =            EVENTS            =
    ==============================*/
    event onTokenPurchase(
        address indexed customerAddress,
        uint256 incomingEthereum,
        uint256 tokensMinted,
        address indexed referredBy
    );

    event onTokenSell(
        address indexed customerAddress,
        uint256 tokensBurned,
        uint256 ethereumEarned
    );

    event onReinvestment(
        address indexed customerAddress,
        uint256 ethereumReinvested,
        uint256 tokensMinted
    );

    event onWithdraw(
        address indexed customerAddress,
        uint256 ethereumWithdrawn
    );

    // ERC20
    event Transfer(
        address indexed from,
        address indexed to,
        uint256 tokens
    );


    /*=====================================
    =            CONFIGURABLES            =
    =====================================*/
    string public name = "WallStreetExchange";
    string public symbol = "STOCK";
    uint8 constant public decimals = 18;

    uint256 constant internal tokenPriceInitial_ = 0.00000001 ether;
    uint256 constant internal tokenPriceIncremental_ = 0.000000001 ether;
    uint256 constant internal magnitude = 2**64;

   
    uint256 public totalEthFundRecieved; // total ETH charity recieved from this contract
    uint256 public totalEthFundCollected; // total ETH charity collected in this contract

    // proof of stake (defaults at 25 tokens)
    uint256 public stakingRequirement = 25e18;

    // ambassador program
    mapping(address => bool) internal ambassadors_;
    uint256 constant internal ambassadorMaxPurchase_ = 2.5 ether;
    uint256 constant internal ambassadorQuota_ = 2.5 ether;



   /*================================
    =            DATASETS            =
    ================================*/
    // amount of shares for each address (scaled number)
    mapping(address => uint256) internal tokenBalanceLedger_;
    mapping(address => uint256) internal referralBalance_;
    mapping(address => int256) internal payoutsTo_;
    mapping(address => uint256) internal ambassadorAccumulatedQuota_;
    uint256 internal tokenSupply_ = 0;
    uint256 internal profitPerShare_;


    uint8 internal dividendFee_ = 20; // 20% dividend fee on each buy and sell
    uint8 internal fundFee_ = 5; // 5% bond fund fee on each buy and sell
    uint8 internal altFundFee_ = 0; // Fund fee rate on each buy and sell for future game


    // administrator list (see above on what they can do)
    mapping(address => bool) public administrators;

    // when this is set to true, only ambassadors can purchase tokens (this prevents a whale premine, it ensures a fairly distributed upper pyramid)
    bool public onlyAmbassadors = true;

    // Special Wall Street Market Platform control from scam game contracts on Wall Street Market platform
    mapping(address => bool) public canAcceptTokens_; // contracts, which can accept Wall Street tokens

    mapping(address => address) public stickyRef;

     address public bondFundAddress = 0x1822435de9b923a7a8c4fbd2f6d0aa8f743d3010;   //Bond Fund
     address public altFundAddress = 0x1822435de9b923a7a8c4fbd2f6d0aa8f743d3010;    //Alternate Fund for Future Game

    /*=======================================
    =            PUBLIC FUNCTIONS            =
    =======================================*/
    /*
    * -- APPLICATION ENTRY POINTS --
    */
    function Exchange()
        public
    {
        // add administrators here
        administrators[msg.sender] = true;
    }
    /**
     * Converts all incoming ethereum to tokens for the caller, and passes down the referral addy (if any)
     */
    function buy(address _referredBy)
        public
        payable
        returns(uint256)
    {
        
        require(tx.gasprice <= 0.05 szabo);
        purchaseTokens(msg.value, _referredBy);
    }

    /**
     * Fallback function to handle ethereum that was send straight to the contract
     * Unfortunately we cannot use a referral address this way.
     */
    function()
        payable
        public
    {
        
        require(tx.gasprice <= 0.05 szabo);
        purchaseTokens(msg.value, 0x0);
    }

    /**
     * Sends Bondf Fund ether to the bond contract
     * 
     */
    function payFund() payable public 
    onlyAdministrator()
    {
        

        uint256 _bondEthToPay = 0;

        uint256 ethToPay = SafeMath.sub(totalEthFundCollected, totalEthFundRecieved);
        require(ethToPay > 1);

        uint256 altEthToPay = SafeMath.div(SafeMath.mul(ethToPay,altFundFee_),100);
        if (altFundFee_ > 0){
            _bondEthToPay = SafeMath.sub(ethToPay,altEthToPay);
        } else{
            _bondEthToPay = 0;
        }

        
        totalEthFundRecieved = SafeMath.add(totalEthFundRecieved, ethToPay);
        if(!bondFundAddress.call.value(_bondEthToPay).gas(400000)()) {
            totalEthFundRecieved = SafeMath.sub(totalEthFundRecieved, _bondEthToPay);
        }

        if(altEthToPay > 0){
            if(!altFundAddress.call.value(altEthToPay).gas(400000)()) {
                totalEthFundRecieved = SafeMath.sub(totalEthFundRecieved, altEthToPay);
            }
        }
      
    }

    /**
     * Converts all of caller's dividends to tokens.
     */
    function reinvest()
        onlyStronghands()
        public
    {
        // fetch dividends
        uint256 _dividends = myDividends(false); // retrieve ref. bonus later in the code

        // pay out the dividends virtually
        address _customerAddress = msg.sender;
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);

        // retrieve ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;

        // dispatch a buy order with the virtualized "withdrawn dividends"
        uint256 _tokens = purchaseTokens(_dividends, 0x0);

        // fire event
        onReinvestment(_customerAddress, _dividends, _tokens);
    }

    /**
     * Alias of sell() and withdraw().
     */
    function exit()
        public
    {
        // get token count for caller & sell them all
        address _customerAddress = msg.sender;
        uint256 _tokens = tokenBalanceLedger_[_customerAddress];
        if(_tokens > 0) sell(_tokens);

        // lambo delivery service
        withdraw();
    }

    /**
     * Withdraws all of the callers earnings.
     */
    function withdraw()
        onlyStronghands()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        uint256 _dividends = myDividends(false); // get ref. bonus later in the code

        // update dividend tracker
        payoutsTo_[_customerAddress] +=  (int256) (_dividends * magnitude);

        // add ref. bonus
        _dividends += referralBalance_[_customerAddress];
        referralBalance_[_customerAddress] = 0;

        // lambo delivery service
        _customerAddress.transfer(_dividends);

        // fire event
        onWithdraw(_customerAddress, _dividends);
    }

    /**
     * Liquifies tokens to ethereum.
     */
    function sell(uint256 _amountOfTokens)
        onlyBagholders()
        public
    {
        // setup data
        address _customerAddress = msg.sender;
        // russian hackers BTFO
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
        uint256 _tokens = _amountOfTokens;
        uint256 _ethereum = tokensToEthereum_(_tokens);

        uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, dividendFee_), 100);
        uint256 _fundPayout = SafeMath.div(SafeMath.mul(_ethereum, fundFee_), 100);
        
        uint256 _refPayout = _dividends / 3;
        _dividends = SafeMath.sub(_dividends, _refPayout);
        (_dividends,) = handleRef(stickyRef[msg.sender], _refPayout, _dividends, 0);

        // Take out dividends and then _fundPayout
        uint256 _taxedEthereum =  SafeMath.sub(SafeMath.sub(_ethereum, _dividends), _fundPayout);

        // Add ethereum to send to fund
        totalEthFundCollected = SafeMath.add(totalEthFundCollected, _fundPayout);

        // burn the sold tokens
        tokenSupply_ = SafeMath.sub(tokenSupply_, _tokens);
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _tokens);

        // update dividends tracker
        int256 _updatedPayouts = (int256) (profitPerShare_ * _tokens + (_taxedEthereum * magnitude));
        payoutsTo_[_customerAddress] -= _updatedPayouts;

        // dividing by zero is a bad idea
        if (tokenSupply_ > 0) {
            // update the amount of dividends per token
            profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
        }

        // fire event
        onTokenSell(_customerAddress, _tokens, _taxedEthereum);
    }


    /**
     * Transfer tokens from the caller to a new holder.
     * REMEMBER THIS IS 0% TRANSFER FEE
     */
    function transfer(address _toAddress, uint256 _amountOfTokens)
        onlyBagholders()
        public
        returns(bool)
    {
        // setup
        address _customerAddress = msg.sender;

        // make sure we have the requested tokens
        // also disables transfers until ambassador phase is over
        // ( we dont want whale premines )
        require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);

        // withdraw all outstanding dividends first
        if(myDividends(true) > 0) withdraw();

        // exchange tokens
        tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
        tokenBalanceLedger_[_toAddress] = SafeMath.add(tokenBalanceLedger_[_toAddress], _amountOfTokens);

        // update dividend trackers
        payoutsTo_[_customerAddress] -= (int256) (profitPerShare_ * _amountOfTokens);
        payoutsTo_[_toAddress] += (int256) (profitPerShare_ * _amountOfTokens);


        // fire event
        Transfer(_customerAddress, _toAddress, _amountOfTokens);

        // ERC20
        return true;
    }

    /**
    * Transfer token to a specified address and forward the data to recipient
    * ERC-677 standard
    * https://github.com/ethereum/EIPs/issues/677
    * @param _to    Receiver address.
    * @param _value Amount of tokens that will be transferred.
    * @param _data  Transaction metadata.
    */
    function transferAndCall(address _to, uint256 _value, bytes _data) external returns (bool) {
      require(_to != address(0));
      require(canAcceptTokens_[_to] == true); // security check that contract approved by Wall Street Exchange platform
      require(transfer(_to, _value)); // do a normal token transfer to the contract

      if (isContract(_to)) {
        AcceptsExchange receiver = AcceptsExchange(_to);
        require(receiver.tokenFallback(msg.sender, _value, _data));
      }

      return true;
    }

    /**
     * Additional check that the game address we are sending tokens to is a contract
     * assemble the given address bytecode. If bytecode exists then the _addr is a contract.
     */
     function isContract(address _addr) private constant returns (bool is_contract) {
       // retrieve the size of the code on target address, this needs assembly
       uint length;
       assembly { length := extcodesize(_addr) }
       return length > 0;
     }

    /*----------  ADMINISTRATOR ONLY FUNCTIONS  ----------*/
    /**
     * In case the amassador quota is not met, the administrator can manually disable the ambassador phase.
     */
    //function disableInitialStage()
    //    onlyAdministrator()
    //    public
    //{
    //    onlyAmbassadors = false;
    //}

    
  
    function setBondFundAddress(address _newBondFundAddress)
        onlyAdministrator()
        public
    {
        bondFundAddress = _newBondFundAddress;
    }

    
    function setAltFundAddress(address _newAltFundAddress)
        onlyAdministrator()
        public
    {
        altFundAddress = _newAltFundAddress;
    }


    /**
     * Set fees/rates
     */
    function setFeeRates(uint8 _newDivRate, uint8 _newFundFee, uint8 _newAltRate)
        onlyAdministrator()
        public
    {
        dividendFee_ = _newDivRate;
        fundFee_ = _newFundFee;
        altFundFee_ = _newAltRate;
    }


    /**
     * In case one of us dies, we need to replace ourselves.
     */
    function setAdministrator(address _identifier, bool _status)
        onlyAdministrator()
        public
    {
        administrators[_identifier] = _status;
    }

    /**
     * Precautionary measures in case we need to adjust the masternode rate.
     */
    function setStakingRequirement(uint256 _amountOfTokens)
        onlyAdministrator()
        public
    {
        stakingRequirement = _amountOfTokens;
    }

    /**
     * Add or remove game contract, which can accept Wall Street Market tokens
     */
    function setCanAcceptTokens(address _address, bool _value)
      onlyAdministrator()
      public
    {
      canAcceptTokens_[_address] = _value;
    }

    /**
     * If we want to rebrand, we can.
     */
    function setName(string _name)
        onlyAdministrator()
        public
    {
        name = _name;
    }

    /**
     * If we want to rebrand, we can.
     */
    function setSymbol(string _symbol)
        onlyAdministrator()
        public
    {
        symbol = _symbol;
    }


    /*----------  HELPERS AND CALCULATORS  ----------*/
    /**
     * Method to view the current Ethereum stored in the contract
     * Example: totalEthereumBalance()
     */
    function totalEthereumBalance()
        public
        view
        returns(uint)
    {
        return this.balance;
    }

    /**
     * Retrieve the total token supply.
     */
    function totalSupply()
        public
        view
        returns(uint256)
    {
        return tokenSupply_;
    }

    /**
     * Retrieve the tokens owned by the caller.
     */
    function myTokens()
        public
        view
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return balanceOf(_customerAddress);
    }

    /**
     * Retrieve the dividends owned by the caller.
     * If `_includeReferralBonus` is to to 1/true, the referral bonus will be included in the calculations.
     * The reason for this, is that in the frontend, we will want to get the total divs (global + ref)
     * But in the internal calculations, we want them separate.
     */
    function myDividends(bool _includeReferralBonus)
        public
        view
        returns(uint256)
    {
        address _customerAddress = msg.sender;
        return _includeReferralBonus ? dividendsOf(_customerAddress) + referralBalance_[_customerAddress] : dividendsOf(_customerAddress) ;
    }

    /**
     * Retrieve the token balance of any single address.
     */
    function balanceOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return tokenBalanceLedger_[_customerAddress];
    }

    /**
     * Retrieve the dividend balance of any single address.
     */
    function dividendsOf(address _customerAddress)
        view
        public
        returns(uint256)
    {
        return (uint256) ((int256)(profitPerShare_ * tokenBalanceLedger_[_customerAddress]) - payoutsTo_[_customerAddress]) / magnitude;
    }

    /**
     * Return the buy price of 1 individual token.
     */
    function sellPrice()
        public
        view
        returns(uint256)
    {
        // our calculation relies on the token supply, so we need supply. Doh.
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ - tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, dividendFee_), 100);
            uint256 _fundPayout = SafeMath.div(SafeMath.mul(_ethereum, fundFee_), 100);
            uint256 _taxedEthereum = SafeMath.sub(SafeMath.sub(_ethereum, _dividends), _fundPayout);
            return _taxedEthereum;
        }
    }

    /**
     * Return the sell price of 1 individual token.
     */
    function buyPrice()
        public
        view
        returns(uint256)
    {
        // our calculation relies on the token supply, so we need supply. Doh.
        if(tokenSupply_ == 0){
            return tokenPriceInitial_ + tokenPriceIncremental_;
        } else {
            uint256 _ethereum = tokensToEthereum_(1e18);
            uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, dividendFee_), 100);
            uint256 _fundPayout = SafeMath.div(SafeMath.mul(_ethereum, fundFee_), 100);
            uint256 _taxedEthereum =  SafeMath.add(SafeMath.add(_ethereum, _dividends), _fundPayout);
            return _taxedEthereum;
        }
    }

    /**
     * Function for the frontend to dynamically retrieve the price scaling of buy orders.
     */
    function calculateTokensReceived(uint256 _ethereumToSpend)
        public
        view
        returns(uint256)
    {
        uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereumToSpend, dividendFee_), 100);
        uint256 _fundPayout = SafeMath.div(SafeMath.mul(_ethereumToSpend, fundFee_), 100);
        uint256 _taxedEthereum = SafeMath.sub(SafeMath.sub(_ethereumToSpend, _dividends), _fundPayout);
        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
        return _amountOfTokens;
    }

    /**
     * Function for the frontend to dynamically retrieve the price scaling of sell orders.
     */
    function calculateEthereumReceived(uint256 _tokensToSell)
        public
        view
        returns(uint256)
    {
        require(_tokensToSell <= tokenSupply_);
        uint256 _ethereum = tokensToEthereum_(_tokensToSell);
        uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, dividendFee_), 100);
        uint256 _fundPayout = SafeMath.div(SafeMath.mul(_ethereum, fundFee_), 100);
        uint256 _taxedEthereum = SafeMath.sub(SafeMath.sub(_ethereum, _dividends), _fundPayout);
        return _taxedEthereum;
    }

    /**
     * Function for the frontend to show ether waiting to be send to fund in contract
     */
    function etherToSendFund()
        public
        view
        returns(uint256) {
        return SafeMath.sub(totalEthFundCollected, totalEthFundRecieved);
    }


    /*==========================================
    =            INTERNAL FUNCTIONS            =
    ==========================================*/

    // Make sure we will send back excess if user sends more then 5 ether before 10 ETH in contract
    function purchaseInternal(uint256 _incomingEthereum, address _referredBy)
      notContract()// no contracts allowed
      internal
      returns(uint256) {

      uint256 purchaseEthereum = _incomingEthereum;
      uint256 excess;
      if(purchaseEthereum > 2.5 ether) { // check if the transaction is over 2.5 ether
          if (SafeMath.sub(address(this).balance, purchaseEthereum) <= 10 ether) { // if so check the contract is less then 100 ether
              purchaseEthereum = 2.5 ether;
              excess = SafeMath.sub(_incomingEthereum, purchaseEthereum);
          }
      }

      purchaseTokens(purchaseEthereum, _referredBy);

      if (excess > 0) {
        msg.sender.transfer(excess);
      }
    }

    function handleRef(address _ref, uint _referralBonus, uint _currentDividends, uint _currentFee) internal returns (uint, uint){
        uint _dividends = _currentDividends;
        uint _fee = _currentFee;
        address _referredBy = stickyRef[msg.sender];
        if (_referredBy == address(0x0)){
            _referredBy = _ref;
        }
        // is the user referred by a masternode?
        if(
            // is this a referred purchase?
            _referredBy != 0x0000000000000000000000000000000000000000 &&

            // no cheating!
            _referredBy != msg.sender &&

            // does the referrer have at least X whole tokens?
            // i.e is the referrer a godly chad masternode
            tokenBalanceLedger_[_referredBy] >= stakingRequirement
        ){
            // wealth redistribution
            if (stickyRef[msg.sender] == address(0x0)){
                stickyRef[msg.sender] = _referredBy;
            }
            referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], _referralBonus/2);
            address currentRef = stickyRef[_referredBy];
            if (currentRef != address(0x0) && tokenBalanceLedger_[currentRef] >= stakingRequirement){
                referralBalance_[currentRef] = SafeMath.add(referralBalance_[currentRef], (_referralBonus/10)*3);
                currentRef = stickyRef[currentRef];
                if (currentRef != address(0x0) && tokenBalanceLedger_[currentRef] >= stakingRequirement){
                    referralBalance_[currentRef] = SafeMath.add(referralBalance_[currentRef], (_referralBonus/10)*2);
                }
                else{
                    _dividends = SafeMath.add(_dividends, _referralBonus - _referralBonus/2 - (_referralBonus/10)*3);
                    _fee = _dividends * magnitude;
                }
            }
            else{
                _dividends = SafeMath.add(_dividends, _referralBonus - _referralBonus/2);
                _fee = _dividends * magnitude;
            }
            
            
        } else {
            // no ref purchase
            // add the referral bonus back to the global dividends cake
            _dividends = SafeMath.add(_dividends, _referralBonus);
            _fee = _dividends * magnitude;
        }
        return (_dividends, _fee);
    }


    function purchaseTokens(uint256 _incomingEthereum, address _referredBy)
       
        internal
        returns(uint256)
    {
        // data setup
        uint256 _undividedDividends = SafeMath.div(SafeMath.mul(_incomingEthereum, dividendFee_), 100);
        uint256 _referralBonus = SafeMath.div(_undividedDividends, 3);
        uint256 _fundPayout = SafeMath.div(SafeMath.mul(_incomingEthereum, fundFee_), 100);
        uint256 _dividends = SafeMath.sub(_undividedDividends, _referralBonus);
        uint256 _fee;
        (_dividends, _fee) = handleRef(_referredBy, _referralBonus, _dividends, _fee);
        uint256 _taxedEthereum = SafeMath.sub(SafeMath.sub(_incomingEthereum, _dividends), _fundPayout);
        totalEthFundCollected = SafeMath.add(totalEthFundCollected, _fundPayout);

        uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);


        // no point in continuing execution if OP is a poorfag russian hacker
        // prevents overflow in the case that the pyramid somehow magically starts being used by everyone in the world
        // (or hackers)
        // and yes we know that the safemath function automatically rules out the "greater then" equasion.
        require(_amountOfTokens > 0 && (SafeMath.add(_amountOfTokens,tokenSupply_) > tokenSupply_));



        // we can't give people infinite ethereum
        if(tokenSupply_ > 0){
 
            // add tokens to the pool
            tokenSupply_ = SafeMath.add(tokenSupply_, _amountOfTokens);

            // take the amount of dividends gained through this transaction, and allocates them evenly to each shareholder
            profitPerShare_ += (_dividends * magnitude / (tokenSupply_));

            // calculate the amount of tokens the customer receives over his purchase
            _fee = _fee - (_fee-(_amountOfTokens * (_dividends * magnitude / (tokenSupply_))));

        } else {
            // add tokens to the pool
            tokenSupply_ = _amountOfTokens;
        }

        // update circulating supply & the ledger address for the customer
        tokenBalanceLedger_[msg.sender] = SafeMath.add(tokenBalanceLedger_[msg.sender], _amountOfTokens);

        // Tells the contract that the buyer doesn't deserve dividends for the tokens before they owned them;
        //really i know you think you do but you don't
        int256 _updatedPayouts = (int256) ((profitPerShare_ * _amountOfTokens) - _fee);
        payoutsTo_[msg.sender] += _updatedPayouts;

        // fire event
        onTokenPurchase(msg.sender, _incomingEthereum, _amountOfTokens, _referredBy);

        return _amountOfTokens;
    }

    /**
     * Calculate Token price based on an amount of incoming ethereum
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
    function ethereumToTokens_(uint256 _ethereum)
        internal
        view
        returns(uint256)
    {
        uint256 _tokenPriceInitial = tokenPriceInitial_ * 1e18;
        uint256 _tokensReceived =
         (
            (
                // underflow attempts BTFO
                SafeMath.sub(
                    (sqrt
                        (
                            (_tokenPriceInitial**2)
                            +
                            (2*(tokenPriceIncremental_ * 1e18)*(_ethereum * 1e18))
                            +
                            (((tokenPriceIncremental_)**2)*(tokenSupply_**2))
                            +
                            (2*(tokenPriceIncremental_)*_tokenPriceInitial*tokenSupply_)
                        )
                    ), _tokenPriceInitial
                )
            )/(tokenPriceIncremental_)
        )-(tokenSupply_)
        ;

        return _tokensReceived;
    }

    /**
     * Calculate token sell value.
     * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
     * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
     */
     function tokensToEthereum_(uint256 _tokens)
        internal
        view
        returns(uint256)
    {

        uint256 tokens_ = (_tokens + 1e18);
        uint256 _tokenSupply = (tokenSupply_ + 1e18);
        uint256 _etherReceived =
        (
            // underflow attempts BTFO
            SafeMath.sub(
                (
                    (
                        (
                            tokenPriceInitial_ +(tokenPriceIncremental_ * (_tokenSupply/1e18))
                        )-tokenPriceIncremental_
                    )*(tokens_ - 1e18)
                ),(tokenPriceIncremental_*((tokens_**2-tokens_)/1e18))/2
            )
        /1e18);
        return _etherReceived;
    }


    //This is where all your gas goes, sorry
    //Not sorry, you probably only paid 1 gwei
    function sqrt(uint x) internal pure returns (uint y) {
        uint z = (x + 1) / 2;
        y = x;
        while (z < y) {
            y = z;
            z = (x / z + z) / 2;
        }
    }
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }

    /**
    * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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