#include<bits/stdc++.h> using namespace std; double kg,cm,bmi; int main(){ cin>>kg>>cm; bmi=kg/((cm*cm)/10000); if(bmi<18.5){ cout<<"thin"; return 0; }else if(bmi>=18.5&&bmi<=24){ cout<<"great"; return 0; }else if(bmi>24){ cout<<"fat"; return 0; } return 0; }