func ack() {
	n = n+1
	if($1 == 0) return ($2+1)
	if($2 == 0) 	 return (ack($1 - 1, 1))
	return (ack($1 - 1, ack($1, $2 - 1)))
}
n=0
while (read(x)) {
	read(y)
	print "x=", x, "   y=", y, "   ack(x,y)=", ack(x,y), "\n"
	print "number of calls to ack()=", n,"\n"	
	n = 0
}