#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>

using namespace std;

int main(){
	long long  n;
	cin >> n;
	long long mod = 1000000000000LL;

	if(n>11000){
		cout << "000000000000" << endl;
		return 0;
	}
	
	long long sum=1;
	bool flag = false;
	for(int i=n; i>0; i--){
		sum *= i;
		if(sum > mod){
			flag = true;
			sum = sum % mod;
		}
	}


	string res = to_string(sum);
	string a = "";
	if(res.length() < 12 && flag){
		for(int i=12-res.length(); i>0; i--){
			a.push_back('0');
		}
	}
	cout << a << res <<endl;
}