contract BasicToken is ERC20Basic {
      using SafeMath for uint256;

      mapping(address => uint256) balances;

      /**
      * @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) returns (bool) {
        require(_to != address(0));

        // 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) constant returns (uint256 balance) {
        return balances[_owner];
      }

    }
/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances. 
 */
function balanceOf(address _owner) constant returns (uint256 balance) {
  return balances[_owner];
}

/**
 * @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.
 */