#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

int main() {
    const long long max = 1e12;
    long long answer = 1, temp = 1;
    long long n;
    cin >> n;
    n = n > 10002 ? 10001 : n;
    for (long long i = 2; i <= n; i++) {
        answer *= i;
        if (temp < max) {
            temp *= i;
        }
        answer %= max;
    }

    if (temp >= max) {
        cout << std::setfill('0') << std::right << std::setw(12) << answer << "\n";
    }
    else {
        cout << answer << "\n";
    }

    int a;
    cin >> a;

    return 0;
}