func main()
	var trick: bit64 :: cui@inputInt() $ bit64
	var treat: bit64 :: cui@inputInt() $ bit64
	var ans: int :: @f(trick.or(treat) $ int)
	do cui@print("\{ans}\n")
end func

func f(n: int): int
	var res: int :: 1
	for i(1, n)
		do res :* i
	end for
	ret res
end func