contract BasicToken is ERC20Basic {
  using SafeMath for uint256;
  mapping(address => uint256) balances;
  uint256 totalSupply_;
  /** @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));
    require(_value <= balances[msg.sender]);
    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _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 balance) {
    return balances[_owner];
  }
}
/** @title Basic token - @dev Basic version of StandardToken, with no allowances. */
function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);
    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }
/** @dev transfer token for a specified address - @param _to The address to transfer to. - @param _value The amount to be transferred. */