#include <iostream>
#include <vector>
#include <cmath>
#include <map>
#include <set>
#include <iomanip>
#include <queue>
#include <algorithm>
#include <numeric>
#include <deque>
#include <complex>
#include <cassert>

using namespace std;
using ll = long long;

int main(){

    ll a, b, c, d=1;
    cin >> a >> b;
    c = a | b;
    for (int i=1; i<=c; i++) d *= i;
    cout << d << endl;

    return 0;
}