#include <iostream>
#include <cmath>

int main() {
  long long int n;
  long long int a = 1;
  std::cin >> n;
  for (int i = 1; i <= n; i++) {
    int t = i % static_cast<long long int>(pow(10, 12));
    a *= t;
    a %= static_cast<long long int>(pow(10, 12));
  }
  std::cout << a << std::endl;
  return 0;
}