#include <cstdio>
#include <iostream>
using namespace std;
typedef long long ll;
const ll mod = 1000000000000;
int main() {
  ll N;
  cin >> N;

  ll num_zeros = 0;
  for (ll i=5;i<=N;i*=5){
    num_zeros += N/i;
    if (num_zeros>=12) break;
  }
  if(num_zeros>=12) printf("000000000000\n");
  else {
    ll ans=1;
    for (ll i=2;i<=N;i+=1){
      ans = ans * i % mod;
    }
    printf("%llu\n", ans);
  }
}