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


/**************************************************************
	Problem: 1035
	User: chensijia
	Language: C++
	Result: Wrong Answer
****************************************************************/