#include <iostream>
#include <cmath>

int main() {
  long long int n;
  long long int a = 1;
  long long int b = static_cast<long long int>(pow(10, 12));
  std::cin >> n;
  if (n > pow(10, 5)) {
    a = 0;
    n = 0;
  }
  for (int i = 1; i <= n; i++) {
    long long int t = i % b;
    a *= t;
    a %= b;
  }
  std::cout << a << std::endl;
  return 0;
}