#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <iomanip>
#include <time.h>
#include <random>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define LONG_INF 10000000000000000
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
int main() {
	long long n;
	cin >> n;
	long long ans = 1;
	long long hoge = 0;
	for (long long i = 1;i <= n;++i) {
		ans *= i;
		if (ans / 1000000000000 != 0) hoge = 1;
		ans %= 1000000000000;
		if (ans == 0) {
			cout << "000000000000" << endl;
			return 0;
		}
	}
	if (hoge == 0) {
		cout << ans << endl;
	}
	else {
		string www = to_string(ans);
		reverse(www.begin(), www.end());
		for (int i = 0;www.length() <= 12;++i) {
			www.push_back(0);
		}
		reverse(www.begin(), www.end());
		cout << www << endl;
		return 0;
	}
	
return	0;
}