#include <iostream>
using namespace std;

const unsigned long N = 1000000007;

unsigned long fact(unsigned long x) {
  if (x == 0) {
    return 1;
  }
  return x * fact(x - 1) % N;
}

int main() {
  unsigned long x;
  cin >> x;
  cout << fact(x) << endl;
  return 0;
}