public int mystery$5($int x$,$ int y$)\{$

if $($x $<0)\{$

return $-$mystery$5(-$x$,$ y$)$;

$\}$ else if $($y $<0)\{$

return $-$mystery$5($x$,-$y$)$;

$\}$ else if $($x $==0$ && y $==0)\{$

return $0$;

$\}$ else $\{$

return $100*$ mystery$5($x $/10,$ y $/10)+10*($x $\%10)+$ y $\%10$;

$\}$

$\}$

mystery$5(5,7)$

mystery$5(12,9)$

mystery$5(-7,4)$

mystery$5(-23,-48)$

mystery$5(128,343)$