#include <iostream>

int main() {
    size_t n, r;
    r = 1;
    std::cin >> n;
    if (n > 49) {
        std::cout << "000000000000" << std::endl;
    } else {
        for (int i = 1; i < n + 1 ; i++) {
            r = r * i;
            r = r % 1000000000000;
        }
        std::cout << r << std::endl;
    }
    return 0;
}