#include <bits/stdc++.h>
using namespace std;
#define int long long
int f(int x){
  int ans = 0;
  while(x != 0){
    ans++;
    x /= 10;
  } 
  return ans;
}
signed main(){
  int N;
  cin>>N;
  if(N >= 50) cout<<"000000000000"<<endl;
  else{
    int ans = 1;
    bool ok = false;
    for(int i=1;i<=N;i++){
      ans *= i;
      if(ans >= 1e12) ok = true;
      ans %= 1000000000000;
    }
    if(ok)for(int i=0;i<12-f(ans);i++) cout<<0;
    cout<<ans<<endl;
  }
}