##PHP, 54, [Cracked][1] ###Code $$$$$$$$$$&(())11122;;;;<<====^^aaaabbbbbbceehhilow{} ###Output 42 ## Original >! $a=21;$b=21;while($b){$a^=$b;$b=($b&$a^$b)<<1;}echo$a; [Original idea][2] [1]: http://codegolf.stackexchange.com/a/41079/2527 [2]: http://codegolf.stackexchange.com/a/21025/2527