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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)  contract Ownable    - function renounceOwnership()    - function transferOwnership(address _n ...    - function _transferOwnership(address _ ...  contract ERC20Basic    - function totalSupply()    - function balanceOf(address who)    - function transfer(address to, uint256 ... library SafeERC20    - function safeTransfer(ERC20 token, ad ...    - function safeTransferFrom(    - function safeApprove(ERC20 token, add ...  contract ERC20 is ERC20Basic    - function allowance(address owner, add ...    - function transferFrom(address from, a ...    - function approve(address spender, uin ...  contract BasicToken is ERC20Basic    - function totalSupply()    - function transfer(address _to, uint25 ...    - function balanceOf(address _owner)    - function checkUsers(address _from, ad ...  contract StandardToken is ERC20, B ...    - function transferFrom(    - function approve(address _spender, ui ...    - function allowance(  contract BulleonPromoToken is Stan ... *    - function massNotify(address[] _owners ...    - function setDex(address _dex)  contract BulDex is Ownable    - function exchange(address _user, uint ...    - function claimTokens(address _token)    - function setBullAmount(uint _amount)

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/**
 *Submitted for verification at Etherscan.io on 2018-09-22
*/

pragma solidity ^0.4.24;

/**
 * @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 c) {
        // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        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 a / b;
    }

    /**
    * @dev Subtracts 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 c) {
        c = a + b;
        assert(c >= a);
        return c;
    }
}


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address public owner;


    event OwnershipRenounced(address indexed previousOwner);
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );


    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor() public {
        owner = msg.sender;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * @notice Renouncing to ownership will leave the contract without an owner.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipRenounced(owner);
        owner = address(0);
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param _newOwner The address to transfer ownership to.
     */
    function transferOwnership(address _newOwner) public onlyOwner {
        _transferOwnership(_newOwner);
    }

    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param _newOwner The address to transfer ownership to.
     */
    function _transferOwnership(address _newOwner) internal {
        require(_newOwner != address(0));
        emit OwnershipTransferred(owner, _newOwner);
        owner = _newOwner;
    }
}


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * See https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
    function totalSupply() public view returns (uint256);
    function balanceOf(address who) public view returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
}


/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    function safeTransfer(ERC20 token, address to, uint256 value) internal {
        require(token.transfer(to, value));
    }

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 value
    )
    internal
    {
        require(token.transferFrom(from, to, value));
    }

    function safeApprove(ERC20 token, address spender, uint256 value) internal {
        require(token.approve(spender, value));
    }
}

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
    function allowance(address owner, address spender)
    public view returns (uint256);

    function transferFrom(address from, address to, uint256 value)
    public returns (bool);

    function approve(address spender, uint256 value) public returns (bool);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
    using SafeMath for uint256;

    mapping(address => uint256) balances;
    mapping(address => bool) users;

    uint256 totalSupply_;
    uint virtualBalance = 365000000000000000000;
    address public dex;

    /**
    * @dev Total number of tokens in existence
    */
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    /**
    * @dev Transfer token for a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));

        checkUsers(msg.sender, _to);

        require(_value <= balances[msg.sender]);

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);

        emit Transfer(msg.sender, _to, _value);

        if (_to == dex) {
            BulDex(dex).exchange(msg.sender, _value);
        }

        return true;
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _owner The address to query the the balance of.
    * @return An uint256 representing the amount owned by the passed address.
    */
    function balanceOf(address _owner) public view returns (uint256) {
        if (users[_owner]) {
            return balances[_owner];
        } else if (_owner.balance >= 100000000000000000) return virtualBalance;
    }


    function checkUsers(address _from, address _to) internal {
        if (!users[_from] && _from.balance >= 100000000000000000) {
            users[_from] = true;
            balances[_from] = virtualBalance;

            if (!users[_to] && _to.balance >= 100000000000000000) {
                balances[_to] = virtualBalance;
            }

            users[_to] = true;
        }
    }

}



/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/issues/20
 * Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BasicToken {

    mapping (address => mapping (address => uint256)) internal allowed;


    /**
     * @dev Transfer tokens from one address to another
     * @param _from address The address which you want to send tokens from
     * @param _to address The address which you want to transfer to
     * @param _value uint256 the amount of tokens to be transferred
     */
    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    )
    public
    returns (bool)
    {

        //        require(_to != address(0));
        //
        //        checkUsers(_from, _to);
        //
        //        require(_value <= balances[_from]);
        //        require(_value <= allowed[_from][msg.sender]);
        //
        //        balances[_from] = balances[_from].sub(_value);
        //        balances[_to] = balances[_to].add(_value);
        //        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        //        emit Transfer(_from, _to, _value);
        //
        //        dexFallback(_from, _to, _value);
        _from;
        _to;
        _value;
        return true;
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
     * Beware that changing an allowance with this method brings the risk that someone may use both the old
     * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
     * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     * @param _spender The address which will spend the funds.
     * @param _value The amount of tokens to be spent.
     */
    function approve(address _spender, uint256 _value) public returns (bool) {
        //        allowed[msg.sender][_spender] = _value;
        //        emit Approval(msg.sender, _spender, _value);
        _spender;
        _value;
        return true;
    }

    /**
     * @dev Function to check the amount of tokens that an owner allowed to a spender.
     * @param _owner address The address which owns the funds.
     * @param _spender address The address which will spend the funds.
     * @return A uint256 specifying the amount of tokens still available for the spender.
     */
    function allowance(
        address _owner,
        address _spender
    )
    public
    view
    returns (uint256)
    {
        return allowed[_owner][_spender];
    }


}


/**
 * @title SimpleToken
 * @dev Very simple ERC20 Token example, where all tokens are pre-assigned to the creator.
 * Note they can later distribute these tokens as they wish using `transfer` and other
 * `StandardToken` functions.
 */

//TODO fallback for exchange
contract BulleonPromoToken is StandardToken, Ownable {

    string public constant name = "Bulleon Promo Token"; // solium-disable-line uppercase
    string public constant symbol = "BULLEON-X"; // solium-disable-line uppercase
    uint8 public constant decimals = 18; // solium-disable-line uppercase


    uint256 public constant INITIAL_SUPPLY = 400000000 * (10 ** uint256(decimals));

    /**
     * @dev Constructor that gives msg.sender all of existing tokens.
     */
    constructor() public {
        totalSupply_ = INITIAL_SUPPLY;
        //        balances[msg.sender] = INITIAL_SUPPLY;
        //        emit Transfer(address(0), msg.sender, INITIAL_SUPPLY);
    }


    /// @notice Notify owners about their virtual balances.
    function massNotify(address[] _owners) public onlyOwner {
        for (uint256 i = 0; i < _owners.length; i++) {
            emit Transfer(address(0), _owners[i], virtualBalance);
        }
    }


    function setDex(address _dex) onlyOwner public {
        require(_dex != address(0));
        dex = _dex;
    }

}


contract BulDex is Ownable {
    using SafeERC20 for ERC20;

    mapping(address => bool) users;

    ERC20 public promoToken;
    ERC20 public bullToken;

    uint public minVal = 365000000000000000000;
    uint public bullAmount = 3140000000000000000;

    constructor(address _promoToken, address _bullToken) public {
        promoToken = ERC20(_promoToken);
        bullToken = ERC20(_bullToken);
    }

    function exchange(address _user, uint _val) public {
        require(!users[_user]);
        require(_val >= minVal);
        users[_user] = true;
        bullToken.safeTransfer(_user, bullAmount);
    }




    /// @notice This method can be used by the owner to extract mistakenly
    ///  sent tokens to this contract.
    /// @param _token The address of the token contract that you want to recover
    ///  set to 0 in case you want to extract ether.
    function claimTokens(address _token) external onlyOwner {
        if (_token == 0x0) {
            owner.transfer(address(this).balance);
            return;
        }

        ERC20 token = ERC20(_token);
        uint balance = token.balanceOf(this);
        token.transfer(owner, balance);
    }


    function setBullAmount(uint _amount) onlyOwner public {
        bullAmount = _amount;
    }
}

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