#include<bits/stdc++.h> using namespace std; double t,m,BMI; int main(){ cin>>t>>m; //freopen("health.in","r",stdin); //freopen("health.out","w",stdout); m=m/100; if(t/(m*m)<18.5){ cout<<"thin"; } if(t/(m*m)>=18.5&&t/(m*m)<=24){ cout<<"great"; } if(t/(m*m)>24){ cout<<"fat"; } return 0; }