#include <iostream>
#include <vector>
#include <map>
#include<string>
#define ll long long
using namespace std;
int main() {
    int a,b,c;
    ll ans=1;
    cin>>a>>b;
    c=a|b;
    for (int i=1;i<=c;i++){
        ans*=i;
    }
    cout<<ans<<endl;
     return 0;
}