#include <bits/stdc++.h>
using namespace std;
bool ssh(int i){
	for(int o=2;o<i;o++){
		if(i%o==0)return 0;
	}
	return 1;
}
int main(){
	int i;
	cin>>i;
	for(int y=2;y<sqrt(i);y++){
		int o=i/y;
		if(ssh(y)&&ssh(o)&&o*y==i){
			cout<<"It's a Tongtong number.";
			return 0;
		}
	}
	cout<<"It's not a Tongtong number.";
	return 0;
}

/**************************************************************
	Problem: 1151
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/