contract BurnableToken is BasicToken {

	event Burn(address indexed burner, uint256 value);

    // destroy his tokens
	function burn(uint256 _value) public {
		require(_value <= balances[msg.sender]);
		
		address burner = msg.sender;
		balances[burner] = balances[burner].sub(_value);
		totalSupply_ = totalSupply_.sub(_value);
		emit Burn(burner, _value);
		// add a Transfer event only to ensure Transfer event record integrity
		emit Transfer(burner, address(0), _value);
	}
}
// anyone can destroy his tokens
function burn(uint256 _value) public {
	require(_value <= balances[msg.sender]);
		
	address burner = msg.sender;
	balances[burner] = balances[burner].sub(_value);
	totalSupply_ = totalSupply_.sub(_value);
	emit Burn(burner, _value);
	// add a Transfer event only to ensure Transfer event record integrity
	emit Transfer(burner, address(0), _value);
}

// destroy his tokens