#include<bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a>=86){
	cout<<"VERY GOOD";
	}else if(a>=60&&a<=85){
		cout<<"GOOD";
	}else{
		cout<<"BAD";
	}

	
}
/**************************************************************
	Problem: 1035
	User: caiqiaoxi
	Language: C++
	Result: Accepted
	Time:25 ms
	Memory:2072 kb
****************************************************************/