#include<bits/stdc++.h>
using namespace std;
int su(int q){
	int i,o=1;
	for(i=2;i<sqrt(q);i++){
		if(q%i==0){
			o=0;
			break;
		} 
	}
	return o;
} 
int main()
{
	int i,n,t;
	cin>>n;
	if(su(n)==0){
		for(i=2;i<n/2;i++){
			if(su(i)==1&&su(n/i)==1){
				cout<<"It's a Tongtong number."; 
				break; 
			} 
		}
	}
	else{
		cout<<"It's not a Tongtong number.";
	} 
return 0;

}

/**************************************************************
	Problem: 1151
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/