#include <bits/stdc++.h>
#ifdef LOCAL
#include "./debug.cpp"
#else
#define debug(...)
#define print_line
#endif
using namespace std;
using ll = long long;

int main() {
    int trick, treat;
    cin >> trick >> treat;

    int trick_or_treat = trick | treat;

    int trick_or_treat_1 = 1;
    for (int i = 1; i <= trick_or_treat_1; i++) {
        trick_or_treat_1 *= i;
    }

    cout << trick_or_treat_1 << endl;
}