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

/**************************************************************
	Problem: 1151
	User: zzz
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/