#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
#include <fstream>
using namespace std;
int main() {
	long long tri, tre;
	cin >> tri >> tre;
	long long ans = 1;
	for (long long i = 1; i <= (tri | tre); i++) {
		ans *= i;
	}
	cout << ans << endl;
}