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