#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    ll ans = 1LL;
    int a, b;
    cin >> a >> b;
    int n = (a | b);
    for (int i = 1; i <= n; i++) {
        ans *= i;
    }
    cout << ans << endl;
    return 0;
}