#include<bits/stdc++.h> using namespace std; double m,h,sum; int main(){ cin>>m>>h; h/=100; sum=m/(h*h); if(sum<18.5)cout<<"thin"<<endl; else if(sum>=18.5&&sum<=24)cout<<"great"<<endl; else if(sum>24)cout<<"fat"<<endl; return 0; }