#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

ll factorial(ll n) {
	ll ret = 1;
	while(n > 0) {
		ret *= n;
		n--;
	}

	return ret;
}

int main() {
	ll a, b;
	cin >> a >> b;

	cout << factorial(a|b) << endl;

	return 0;
}