#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll MOD = 1000000007;
using P = pair<int,int>;
#define rep(i, n) for(int i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()

int main(){
    int x,y;
    cin >> x >> y;
    int z = x | y;
    ll ans = 1;
    rep(i,z) ans *= i + 1;
    cout << ans << endl;
    return 0;
}