#include <bits/stdc++.h>

using namespace std;

typedef long long int64;

const int64 mod = 1000000000000LL;

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

  int64 fact = 1;
  for(int i = 1; i <= min(100, N); i++) {
    fact *= i;
    fact %= mod;
  }

  cout << fact << endl;

}