#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

int main(){
  int A, B; cin >> A >> B;
  int ans = 0, i = 8;
  while(i != 0){
    if(i <= A or i <= B){
      ans += i;
    }
    A %= i;
    B %= i;
    i /= 2;
  }
  ll ans2 = 1;
  while(ans != 0){
      ans2 *= ans;
      ans--;
  }
  cout << ans2 << endl;
}