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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 Ownable()
•    - function transferOwnership(address ne ...
•  contract ERC20Basic
•    - function balanceOf(address who)
•    - function transfer(address to, uint256 ...
•  contract ERC20 is ERC20Basic
•    - function allowance(address owner, add ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
•  contract REDToken is ERC20, Ownabl ... *
•    - function transfer(address _to, uint25 ...
•    - function transferFrom(address _from, ...
•    - function approve(address _spender, ui ...
•    - function allowance(address _owner, ad ...
•    - function balanceOf(address _owner)
•    - function REDToken()
•    - function startCrowdfund()
•    - function isEarlyBirdsStage()
•    - function setCrowdfundAddress(address ...
•    - function transferFromCrowdfund(addres ...
•    - function releaseRedTeamTokens()
•    - function releaseMarketingTokens()
•    - function finalizeEarlyBirds()
•    - function finalizeCrowdfund()
•    - function changeRedTeamAddress(address ...
•    - function changeMarketingAddress(addre ...
•    - function partialUnlockAngelsAccounts( ...
•    - function fullUnlockAngelsAccounts(add ...
•    - function deliverAngelsREDAccounts(add ...
•    - function deliverAngelsREDBalance(addr ...
•    - function addToBalance(address _addres ...
•    - function decrementBalance(address _ad ...

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/**
 *Submitted for verification at Etherscan.io on 2018-01-07
*/

pragma solidity ^0.4.18;


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

  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;
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 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 OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() 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 transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  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 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);
}


contract REDToken is ERC20, Ownable {

    using SafeMath for uint;

/*----------------- Token Information -----------------*/

    string public constant name = "Red Community Token";
    string public constant symbol = "RED";

    uint8 public decimals = 18;                            // (ERC20 API) Decimal precision, factor is 1e18

    mapping (address => uint256) angels;                   // Angels accounts table (during locking period only)
    mapping (address => uint256) accounts;                 // User's accounts table
    mapping (address => mapping (address => uint256)) allowed; // User's allowances table

/*----------------- ICO Information -----------------*/

    uint256 public angelSupply;                            // Angels sale supply
    uint256 public earlyBirdsSupply;                       // Early birds supply
    uint256 public publicSupply;                           // Open round supply
    uint256 public foundationSupply;                       // Red Foundation/Community supply
    uint256 public redTeamSupply;                          // Red team supply
    uint256 public marketingSupply;                        // Marketing & strategic supply

    uint256 public angelAmountRemaining;                   // Amount of private angels tokens remaining at a given time
    uint256 public icoStartsAt;                            // Crowdsale ending timestamp
    uint256 public icoEndsAt;                              // Crowdsale ending timestamp
    uint256 public redTeamLockingPeriod;                   // Locking period for Red team's supply
    uint256 public angelLockingPeriod;                     // Locking period for Angel's supply

    address public crowdfundAddress;                       // Crowdfunding contract address
    address public redTeamAddress;                         // Red team address
    address public foundationAddress;                      // Foundation address
    address public marketingAddress;                       // Private equity address

    bool public unlock20Done = false;                      // Allows the 20% unlocking for angels only once

    enum icoStages {
        Ready,                                             // Initial state on contract's creation
        EarlyBirds,                                        // Early birds state
        PublicSale,                                        // Public crowdsale state
        Done                                               // Ending state after ICO
    }
    icoStages stage;                                       // Crowdfunding current state

/*----------------- Events -----------------*/

    event EarlyBirdsFinalized(uint tokensRemaining);       // Event called when early birds round is done
    event CrowdfundFinalized(uint tokensRemaining);        // Event called when crowdfund is done

/*----------------- Modifiers -----------------*/

    modifier nonZeroAddress(address _to) {                 // Ensures an address is provided
        require(_to != 0x0);
        _;
    }

    modifier nonZeroAmount(uint _amount) {                 // Ensures a non-zero amount
        require(_amount > 0);
        _;
    }

    modifier nonZeroValue() {                              // Ensures a non-zero value is passed
        require(msg.value > 0);
        _;
    }

    modifier onlyDuringCrowdfund(){                   // Ensures actions can only happen after crowdfund ends
        require((now >= icoStartsAt) && (now < icoEndsAt));
        _;
    }

    modifier notBeforeCrowdfundEnds(){                     // Ensures actions can only happen after crowdfund ends
        require(now >= icoEndsAt);
        _;
    }

    modifier checkRedTeamLockingPeriod() {                 // Ensures locking period is over
        require(now >= redTeamLockingPeriod);
        _;
    }

    modifier checkAngelsLockingPeriod() {                  // Ensures locking period is over
        require(now >= angelLockingPeriod);
        _;
    }

    modifier onlyCrowdfund() {                             // Ensures only crowdfund can call the function
        require(msg.sender == crowdfundAddress);
        _;
    }

/*----------------- ERC20 API -----------------*/

    // -------------------------------------------------
    // Transfers amount to address
    // -------------------------------------------------
    function transfer(address _to, uint256 _amount) public notBeforeCrowdfundEnds returns (bool success) {
        require(accounts[msg.sender] >= _amount);         // check amount of balance can be tranfered
        addToBalance(_to, _amount);
        decrementBalance(msg.sender, _amount);
        Transfer(msg.sender, _to, _amount);
        return true;
    }

    // -------------------------------------------------
    // Transfers from one address to another (need allowance to be called first)
    // -------------------------------------------------
    function transferFrom(address _from, address _to, uint256 _amount) public notBeforeCrowdfundEnds returns (bool success) {
        require(allowance(_from, msg.sender) >= _amount);
        decrementBalance(_from, _amount);
        addToBalance(_to, _amount);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_amount);
        Transfer(_from, _to, _amount);
        return true;
    }

    // -------------------------------------------------
    // Approves another address a certain amount of RED
    // -------------------------------------------------
    function approve(address _spender, uint256 _value) public returns (bool success) {
        require((_value == 0) || (allowance(msg.sender, _spender) == 0));
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    // -------------------------------------------------
    // Gets an address's RED allowance
    // -------------------------------------------------
    function allowance(address _owner, address _spender) public constant returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }

    // -------------------------------------------------
    // Gets the RED balance of any address
    // -------------------------------------------------
    function balanceOf(address _owner) public constant returns (uint256 balance) {
        return accounts[_owner] + angels[_owner];
    }


/*----------------- Token API -----------------*/

    // -------------------------------------------------
    // Contract's constructor
    // -------------------------------------------------
    function REDToken() public {
        totalSupply         = 200000000 * 1e18;             // 100% - 200 million total RED with 18 decimals

        angelSupply         =  20000000 * 1e18;             //  10% -  20 million RED for private angels sale
        earlyBirdsSupply    =  48000000 * 1e18;             //  24% -  48 million RED for early-bird sale
        publicSupply        =  12000000 * 1e18;             //   6% -  12 million RED for the public crowdsale
        redTeamSupply       =  30000000 * 1e18;             //  15% -  30 million RED for Red team
        foundationSupply    =  70000000 * 1e18;             //  35% -  70 million RED for foundation/incentivising efforts
        marketingSupply     =  20000000 * 1e18;             //  10% -  20 million RED for covering marketing and strategic expenses

        angelAmountRemaining = angelSupply;                 // Decreased over the course of the private angel sale
        redTeamAddress       = 0x31aa507c140E012d0DcAf041d482e04F36323B03;       // Red Team address
        foundationAddress    = 0x93e3AF42939C163Ee4146F63646Fb4C286CDbFeC;       // Foundation/Community address
        marketingAddress     = 0x0;                         // Marketing/Strategic address

        icoStartsAt          = 1515398400;                  // Jan 8th 2018, 16:00, GMT+8
        icoEndsAt            = 1517385600;                  // Jan 31th 2018, 16:00, GMT+8
        angelLockingPeriod   = icoEndsAt.add(90 days);      //  3 months locking period
        redTeamLockingPeriod = icoEndsAt.add(365 days);     // 12 months locking period

        addToBalance(foundationAddress, foundationSupply);

        stage = icoStages.Ready;                            // Initializes state
    }

    // -------------------------------------------------
    // Opens early birds sale
    // -------------------------------------------------
    function startCrowdfund() external onlyCrowdfund onlyDuringCrowdfund returns(bool) {
        require(stage == icoStages.Ready);
        stage = icoStages.EarlyBirds;
        addToBalance(crowdfundAddress, earlyBirdsSupply);
        return true;
    }

    // -------------------------------------------------
    // Returns TRUE if early birds round is currently going on
    // -------------------------------------------------
    function isEarlyBirdsStage() external view returns(bool) {
        return (stage == icoStages.EarlyBirds);
    }

    // -------------------------------------------------
    // Sets the crowdfund address, can only be done once
    // -------------------------------------------------
    function setCrowdfundAddress(address _crowdfundAddress) external onlyOwner nonZeroAddress(_crowdfundAddress) {
        require(crowdfundAddress == 0x0);
        crowdfundAddress = _crowdfundAddress;
    }

    // -------------------------------------------------
    // Function for the Crowdfund to transfer tokens
    // -------------------------------------------------
    function transferFromCrowdfund(address _to, uint256 _amount) external onlyCrowdfund nonZeroAmount(_amount) nonZeroAddress(_to) returns (bool success) {
        require(balanceOf(crowdfundAddress) >= _amount);
        decrementBalance(crowdfundAddress, _amount);
        addToBalance(_to, _amount);
        Transfer(0x0, _to, _amount);
        return true;
    }

    // -------------------------------------------------
    // Releases Red team supply after locking period is passed
    // -------------------------------------------------
    function releaseRedTeamTokens() external checkRedTeamLockingPeriod onlyOwner returns(bool success) {
        require(redTeamSupply > 0);
        addToBalance(redTeamAddress, redTeamSupply);
        Transfer(0x0, redTeamAddress, redTeamSupply);
        redTeamSupply = 0;
        return true;
    }

    // -------------------------------------------------
    // Releases Marketing & strategic supply
    // -------------------------------------------------
    function releaseMarketingTokens() external onlyOwner returns(bool success) {
        require(marketingSupply > 0);
        addToBalance(marketingAddress, marketingSupply);
        Transfer(0x0, marketingAddress, marketingSupply);
        marketingSupply = 0;
        return true;
    }

    // -------------------------------------------------
    // Finalizes early birds round. If some RED are left, let them overflow to the crowdfund
    // -------------------------------------------------
    function finalizeEarlyBirds() external onlyOwner returns (bool success) {
        require(stage == icoStages.EarlyBirds);
        uint256 amount = balanceOf(crowdfundAddress);
        addToBalance(crowdfundAddress, publicSupply);
        stage = icoStages.PublicSale;
        EarlyBirdsFinalized(amount);                       // event log
        return true;
    }

    // -------------------------------------------------
    // Finalizes crowdfund. If there are leftover RED, let them overflow to foundation
    // -------------------------------------------------
    function finalizeCrowdfund() external onlyCrowdfund {
        require(stage == icoStages.PublicSale);
        uint256 amount = balanceOf(crowdfundAddress);
        if (amount > 0) {
            accounts[crowdfundAddress] = 0;
            addToBalance(foundationAddress, amount);
            Transfer(crowdfundAddress, foundationAddress, amount);
        }
        stage = icoStages.Done;
        CrowdfundFinalized(amount);                        // event log
    }

    // -------------------------------------------------
    // Changes Red Team wallet
    // -------------------------------------------------
    function changeRedTeamAddress(address _wallet) external onlyOwner {
        redTeamAddress = _wallet;
    }

    // -------------------------------------------------
    // Changes Marketing&Strategic wallet
    // -------------------------------------------------
    function changeMarketingAddress(address _wallet) external onlyOwner {
        marketingAddress = _wallet;
    }

    // -------------------------------------------------
    // Function to unlock 20% RED to private angels investors
    // -------------------------------------------------
    function partialUnlockAngelsAccounts(address[] _batchOfAddresses) external onlyOwner notBeforeCrowdfundEnds returns (bool success) {
        require(unlock20Done == false);
        uint256 amount;
        address holder;
        for (uint256 i = 0; i < _batchOfAddresses.length; i++) {
            holder = _batchOfAddresses[i];
            amount = angels[holder].mul(20).div(100);
            angels[holder] = angels[holder].sub(amount);
            addToBalance(holder, amount);
        }
        unlock20Done = true;
        return true;
    }

    // -------------------------------------------------
    // Function to unlock all remaining RED to private angels investors (after 3 months)
    // -------------------------------------------------
    function fullUnlockAngelsAccounts(address[] _batchOfAddresses) external onlyOwner checkAngelsLockingPeriod returns (bool success) {
        uint256 amount;
        address holder;
        for (uint256 i = 0; i < _batchOfAddresses.length; i++) {
            holder = _batchOfAddresses[i];
            amount = angels[holder];
            angels[holder] = 0;
            addToBalance(holder, amount);
        }
        return true;
    }

    // -------------------------------------------------
    // Function to reserve RED to private angels investors (initially locked)
    // the amount of RED is in Wei
    // -------------------------------------------------
    function deliverAngelsREDAccounts(address[] _batchOfAddresses, uint[] _amountOfRED) external onlyOwner onlyDuringCrowdfund returns (bool success) {
        for (uint256 i = 0; i < _batchOfAddresses.length; i++) {
            deliverAngelsREDBalance(_batchOfAddresses[i], _amountOfRED[i]);
        }
        return true;
    }
/*----------------- Helper functions -----------------*/
    // -------------------------------------------------
    // If one address has contributed more than once,
    // the contributions will be aggregated
    // -------------------------------------------------
    function deliverAngelsREDBalance(address _accountHolder, uint _amountOfBoughtRED) internal onlyOwner {
        require(angelAmountRemaining > 0);
        angels[_accountHolder] = angels[_accountHolder].add(_amountOfBoughtRED);
        Transfer(0x0, _accountHolder, _amountOfBoughtRED);
        angelAmountRemaining = angelAmountRemaining.sub(_amountOfBoughtRED);
    }

    // -------------------------------------------------
    // Adds to balance
    // -------------------------------------------------
    function addToBalance(address _address, uint _amount) internal {
        accounts[_address] = accounts[_address].add(_amount);
    }

    // -------------------------------------------------
    // Removes from balance
    // -------------------------------------------------
    function decrementBalance(address _address, uint _amount) internal {
        accounts[_address] = accounts[_address].sub(_amount);
    }
}

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