// Compile me with -std=c++14 or higher

#include <bits/stdc++.h>

using namespace std;

using func_t = std::function <long double (long double)>;
const long double epsilon = 1e-2;
auto make_derivative(func_t func) {
    return [func](long double x) -> long double {
        return (func(x + epsilon) - func(x - epsilon)) / (2.0 * epsilon);
    };
}

long long factorial(long long n) {
    func_t func = [n](long double x) -> long double {
        return pow(x, n);
    };

    func_t tmp = func;
    for (int i = 0; i < n; ++i) {
        tmp = make_derivative(tmp);
    }

    return (long long)round(tmp(1.0));
}

int main() {
    int n;
    cin >> n;

    cout << factorial(n) << endl;
}