#include<bits/stdc++.h> using namespace std; double a,b; int main(){ cin>>a>>b; // freopen("","r",stdin); // freopen("","w",stdout); b/=100; if(a/(b*b)<18.5)cout<<"thin"; else if(a/(b*b)>=18.5&&a/(b*b)<=24)cout<<"great"; else cout<<"fat"; }