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