pragma solidity ^0.4.10;

contract Token {
  /// @return total amount of tokens
  function totalSupply() constant returns (uint256 supply) {}

  /// @param _owner The address from which the balance will be retrieved
  /// @return The balance
  function balanceOf(address _owner) constant returns (uint256 balance) {}

  /// @notice send `_value` token to `_to` from `msg.sender`
  /// @param _to The address of the recipient
  /// @param _value The amount of token to be transferred
  /// @return Whether the transfer was successful or not
  function transfer(address _to, uint256 _value) returns (bool success) {}

  /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
  /// @param _from The address of the sender
  /// @param _to The address of the recipient
  /// @param _value The amount of token to be transferred
  /// @return Whether the transfer was successful or not
  function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}

  /// @notice `msg.sender` approves `_addr` to spend `_value` tokens
  /// @param _spender The address of the account able to transfer the tokens
  /// @param _value The amount of wei to be approved for transfer
  /// @return Whether the approval was successful or not
  function approve(address _spender, uint256 _value) returns (bool success) {}

  /// @param _owner The address of the account owning tokens
  /// @param _spender The address of the account able to transfer the tokens
  /// @return Amount of remaining tokens allowed to spent
  function allowance(address _owner, address _spender) constant returns (uint256 remaining) {}

  event Transfer(address indexed _from, address indexed _to, uint256 _value);
  event Approval(address indexed _owner, address indexed _spender, uint256 _value);

  uint public decimals;
  string public name;
}

contract StandardToken is Token {

  function transfer(address _to, uint256 _value) returns (bool success) {
    //Default assumes totalSupply can't be over max (2^256 - 1).
    //If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn't wrap.
    //Replace the if with this one instead.
    if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
    //if (balances[msg.sender] >= _value && _value > 0) {
      balances[msg.sender] -= _value;
      balances[_to] += _value;
      Transfer(msg.sender, _to, _value);
      return true;
    } else { return false; }
  }

  function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
    //same as above. Replace this line with the following if you want to protect against wrapping uints.
    if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
    //if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
      balances[_to] += _value;
      balances[_from] -= _value;
      allowed[_from][msg.sender] -= _value;
      Transfer(_from, _to, _value);
      return true;
    } else { return false; }
  }

  function balanceOf(address _owner) constant returns (uint256 balance) {
    return balances[_owner];
  }

  function approve(address _spender, uint256 _value) returns (bool success) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
    return allowed[_owner][_spender];
  }

  mapping(address => uint256) balances;

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

  uint256 public totalSupply;
}

contract MyERC20 is StandardToken {

    // metadata
    string public constant name = "MyERC20Token";
    string public constant symbol = "ERC";
    uint public constant decimals = 18;

    // stakeholder addresses
    address public constant FOUNDATION = 0x642dab093d6e7518dfdcb450e23108038cf667c6;
    address public constant FOUNDER_1 = 0xb1f49e6c1d2306862253ef516a07aedded28ae15;
    address public constant FOUNDER_2 = 0xb1fdea258e9d67fc121821b38ffc32a70c873964;
    address public constant INVESTOR_1 = 0xe15268cd67501f4766a9fc20e121d1f82aa397c3;
    address public constant INVESTOR_2 = 0x175037c16c0e433f86590d99afb33e5e3560d263;

    // stakeholder allocations as a percentage of total supply
    uint public totalSupply = 10e6 * 10 ** decimals;
    uint public constant FOUNDATION_ALLOCATION = 20;
    uint public constant FOUNDER_1_ALLOCATION = 5;
    uint public constant FOUNDER_2_ALLOCATION = 5;
    uint public constant INVESTOR_1_ALLOCATION = 3;
    uint public constant INVESTOR_2_ALLOCATION = 2;

    // constructor
    function MyERC20() {
        balances[FOUNDATION] = FOUNDATION_ALLOCATION * totalSupply / 100;
        balances[FOUNDER_1] = FOUNDER_1_ALLOCATION * totalSupply / 100;
        balances[FOUNDER_2] = FOUNDER_2_ALLOCATION * totalSupply / 100;
        balances[INVESTOR_1] = INVESTOR_1_ALLOCATION * totalSupply / 100;
        balances[INVESTOR_2] = INVESTOR_2_ALLOCATION * totalSupply / 100;
    }
}