#define _USE_MATH_DEFINES
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include <sstream>
#include<iomanip>

//#include<bits/stdc++.h>


using namespace std;

int main() {

	long long int x=1,r;
	cin >> r;
	bool f = 0;
	if (r >= 50) {
		cout << "000000000000" << endl;
		return 0;
	}
	for (int i = 1; i <= r; i++) {
		x *= i;
		if (x >= 1000000000000)f = 1;
		x %= 1000000000000;
	}
	long long int t = 100000000000;
	while (t > x&&f) {
		cout << 0;
		t /= 10;
	}
	cout << x << endl;
	return 0;
}