#include<bits/stdc++.h>
using namespace std;

bool s(int a){
  bool l=0;
  int i;
  for(i=2;i<=a/2;i++){
  if(a%i==0){
  l=1;
  break;
  }}
  return l;
}
int main(){
  int x,n;
  cin>>n;
  for(x=2;x<n;x++){
  if(n%x==0){
  if(s(x)==0&&s(n/x)==0&&x*(n/x)==n){
  cout<<"It's a Tongtong number.";
  break;
   } 
  else{
  cout<<"It's not a Tongtong number.";
  break;
  	}
  }
  }
  return 0;
}
/**************************************************************
	Problem: 1151
	User: wtq001
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/