#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
using T = tuple<int, int, int>;
#define al(a) a.begin(), a.end()
#define ral(a) a.rbegin(), a.rend()
#define sz(a) (int)a.size()
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rrep(i, n) for (int i = 1; i <= (n); ++i)
#define drep(i, n) for (int i = (n)-1; i >= 0; --i)
#define db(a, b) cout << #a << ": " << a << " " << #b << ": " << b << endl;

int main() {
  ll n;
  cin >> n;
  ll ans = 1;
  ll mod = 1e12;
  // cout << mod << endl;
  for (ll i = 1; i <= n; ++i) {
    ans *= i;
    ans %= mod;
    if (ans == 0) break;
  }
  string s = to_string(ans);
  if (ans == 0)
    cout << "000000000000" << endl;
  else {
    if (n <= 15)
      cout << ans << endl;
    else {
      while (sz(s) < 12) { s = '0' + s; }
      cout << s << endl;
    }
  }

  return 0;
}