#include<bits/stdc++.h>
using namespace std;
bool k(int m){
	for(int i=2;i<=sqrt(m);i++){
		if(m%i==0) return false;
	}
	return true;
}
int main(){
    int n;
    cin>>n;
    for(int i=2;i<=sqrt(n);i++){
		if(k(i)&&k(n/i)&&i*(n/i)==n){
			cout<<"It's a Tongtong number.";
			return 0;
		}
	}
	cout<<"It's not a Tongtong number.";
}
/**************************************************************
	Problem: 1151
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/