#include<bits/stdc++.h> using namespace std; int main() { double a,b,c=18.5,d=24.0; cin>>a>>b; if(a/(b*b)<c/(b*b)) cout<<"thin"; else if(a/(b*b)>d/(b*b)) cout<<"fat"; else if(a/(b*b)>=c/(b*b)&&a/(b*b)<=d/(b*b)) cout<<"great"; return 0; }