#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>

#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>

#include <functional>
#include <cassert>

typedef long long ll;
using namespace std;

#define debug(x) cerr << #x << " = " << (x) << endl;


//#define mod 1000000007 //1e9+7(prime number)
#define INF 1000000000 //1e9
#define LLINF 2000000000000000000LL //2e18
#define SIZE 100010

int main(){
  ll n;

  cin >> n;
  
  ll ans = 1;
  ll mod = 1000000000000LL;

  bool flag = false;
  
  for(int i=1;i<=n;i++){
    flag |= (ans*i)/mod > 0;
    ans = (ans * i)%mod;

    if(ans == 0) break;
  }

  if(flag){
    printf("%012lld\n",ans);
  }else{
    cout << ans << endl;
  }
  
  return 0;
}