int foo$2($int k$)$

$\{$

$k=k+3$;

return $k$; $//$B

$\}$

int foo$3($int k$)$

$\{$

$k=k+2$;$\frac{,}{\frac{?}{?}}C$

return $k$;

$\}$

int foo$($int $x,$ int $y)$

$\{$

int z$,$w; $//$A

$z=$ foo$2($x$)$;

$w=$ foo$3($y$)$; $\frac{,}{\frac{?}{?}}D$

return $z^{+}w$;

$\}$