#include<bits/stdc++.h> using namespace std; int main() { double a,b,c=18.5,d=24.0; cin>>a>>b; if(a/(b/100*b/100)<c/(b/100*b/100)) cout<<"thin"; else if(a/(b/100*b/100)>d/(b/100*b/100)) cout<<"fat"; else if(a/(b/100*b/100)>=c/(b/100*b/100)&&a/(b/100*b/100)<=d/(b/100*b/100)) cout<<"great"; return 0; }