#include<bits/stdc++.h>
using namespace std;
int64_t fac(int64_t n){
	if(n==1){
		return 1;
	}
	else{
		return n*fac(n-1);
	}
}
int main(){
	int64_t trick,treat;
	cin>>trick>>treat;
	cout<<fac(trick|treat)<<endl;
}