//#include <atcoder/all>
//using namespace atcoder;
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(v) v.begin(),v.end()
typedef long long ll;
#define int ll
using vi = vector<int>;
using vs = vector<string>;
using P = pair<int,int>;
template<typename T> bool chmax(T &a, const T b) {if (a < b) {a = b; return true;} else return false; }
template<typename T> bool chmin(T &a, const T b) {if (a > b) {a = b; return true;} else return false; }
const int INF = 1e18;
//using mint = modint1000000007;
//using mint = modint998244353;

int f(int n){
    int res = 1;
    rep(i,n)res*=i+1;
    return res;
}
signed main() {
   cin.tie(0);
   ios_base::sync_with_stdio(false);
   cout << fixed << setprecision(20);

   int a,b;cin>>a>>b;

   cout << f(a|b) <<"\n";
   return 0;
}