#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define PI 3.1415926535897932384626
mt19937_64 rang(chrono::high_resolution_clock::now().time_since_epoch().count());

 
 
const int mod = 1'000'000'007;
const int N = 3e5, M = N;
 

 
 
void solve() {
 ll a, b;
 cin >> a >> b;
 ll g = a | b;
 ll ans = 1;
 for(int i = 1; i <= g; i++){
  ans *= i;
 } 
 cout << ans << "\n";
 
}
 
 
int main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    srand(chrono::high_resolution_clock::now().time_since_epoch().count());
 
    int t = 1;
    //cin >> t;
    while(t--) {
      solve();
    }
 
    return 0;
}