// PR Bab 14, soal 2 -- pembahasan.

#include <iostream>
using namespace std;

const long long MOD = 1000000007;

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

    long long hasil = 1;
    for (int i = 2; i <= n; i++) hasil = hasil * i % MOD;

    cout << hasil << "\n";
    return 0;
}