#include <bits/stdc++.h>

using std::cin;
using std::cout;
using ll = long long;

ll f(int x) {
	if (x == 1) return x;
	return (ll)x * f(x-1);
}

int main() {
	int n, m;
	cin >> n >> m;
	
	int x = n | m;
	ll ans = f(x);
	cout << ans << '\n';
	
	return 0;
}