#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <cmath>
#include <ctime>
using namespace std;
void optimize(vector<int>& v, int new_i) {
    int size = to_string(new_i).length() + 1;
    for (int i = 0; i < size; ++i) v.push_back(0);
    for (int i = 0; i < v.size() - size; ++i) {
        int number = v[i];
        v[i] -= number;
        int cnt = 0;
        while (number > 0) {
            v[i + cnt] += number % 10;
            ++cnt;
            number /= 10;
        }
    }
    while (v[v.size() - 1] == 0) {
        v.pop_back();
    }
}
int main() {
	unsigned int start_time = clock();
    ifstream fin("input.txt");
    int num;
    fin >> num;
    vector<int> v = { 1 };
    for (int i = 1; i <= num; ++i) {
        for (int j = 0; j < v.size(); ++j) {
            v[j] *= i;
        }
        optimize(v, i);
    }
    //ofstream cout("output.txt");
    reverse(v.begin(), v.end());
    for (auto el : v) {
        cout << el;
    }
    cout << endl;
	unsigned int end_time = clock();
	cout << end_time - start_time << endl;
    //cout << num << endl;
    //cout.close();
    fin.close();
    system("pause");
}