#include <bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a>=86){
	cout<<"VERY GOOD"<<endl;	
	}else if(a>=60){
    cout<<"GOOD"<<endl;
	}else{cout<<"BAD"<<endl;
	}
	
	return 0;
	
}
/**************************************************************
	Problem: 1035
	User: huanghao
	Language: C++
	Result: Accepted
	Time:24 ms
	Memory:2072 kb
****************************************************************/