midcode.txt

const,	int,	1,	a;
int,	 ,	 ,	b;
start,	int,	 ,	square;
para,	int,	0,	x;
para,	int,	0,	y;
para,	int,	0,	h;
int,	 ,	 ,	s;
add,	x,	y,	$0;
imul,	$0,	h,	$1;
idiv,	$1,	2,	$2;
mov,	$2,	 ,	s;
ret,	 ,	 ,	s;
end,	 ,	 ,	square;

start,	 ,	 ,	main;
int,	 ,	 ,	x;
int,	 ,	 ,	y;
int,	 ,	 ,	h;
scanf,	int,	 ,	x;
scanf,	int,	 ,	y;
scanf,	int,	 ,	y;
scanf,	int,	 ,	h;
para,	 ,	1,	x;
para,	 ,	1,	y;
para,	 ,	1,	h;
call,	square,	int,	$0;
printf,	,	$0,	 ;
end,	 ,	 ,	main;