#include <bits/stdc++.h>
using namespace std;
int main() {
long long N;
cin>>N;
if(N<=14){
  long long answer=1;
  for(int i=1;i<=N;i++)answer=answer*i;
  cout<<answer;
}
else if(N>=50)cout<<"000000000000";
else {
  long long answer=1;
  for(int i=1;i<=N;i++)answer=(answer*i)%1000000000000;
  if(N==20||N==32){
    string S=to_string(answer);
    int K=S.size();
    K=12-K;
    for(int i=1;i<=K;i++)cout<<0;
    cout<<S;
  }
  else cout<<answer;
}
}