#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1000000000000;
int main(){
  long long N;
  cin >> N;
  if (N >= 50){
    cout << "000000000000" << endl;
  } else {
    long long ans = 1;
    bool big = false;
    for (int i = 1; i <= N; i++){
      ans *= i;
      if (ans >= MOD){
        big = true;
        ans %= MOD;
      }
    }
    string S = to_string(ans);
    if (big){
      while (S.size() < 12){
        S = '0' + S;
      }
    }
    cout << S << endl;
  }
}