#include <bits/stdc++.h>
using namespace std;
int a;
int main(){
    cin>>a;
    if(a>=86){
    cout<<"VERY GOOD"<<endl;    
    }else if(a>=60){
    cout<<"GOOD"<<endl;
    }else{cout<<"BAD"<<endl;
    } 
}
/**************************************************************
	Problem: 1035
	User: chenyichuen
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2072 kb
****************************************************************/