#include<bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int n;
  cin>>n;
  if(n>100){
    cout<<"000000000000"<<endl;
    return 0;
  }
  int res=1,f=0;
  for(int i=1;i<=n;i++){
    res*=i;
    if(res>=1000000000000LL){
      res%=1000000000000LL;
      f=1;
    }
  }
  string ans=to_string(res);
  if(f) while((int)ans.size()<12) ans="0"+ans;
  cout<<ans<<endl;
  return 0;
}