#include <cmath>
#include <string>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
	int a, b;
	cin >> a >> b;
	int x = a | b;
	long long ans = 1;
	for (int i = 1; i <= x; ++i) {
		ans *= i;
	}
	cout << ans << endl;
	return 0;
}