#include<bits/stdc++.h>
using namespace std;
int main(){
	int s;
	cin>>s;
	if(s>=86){
		cout<<"VERY GOOD"; 
	}
	if(s>=60&&s<=85){
		cout<<"GOOD";
	}
	if(s<60){
		cout<<"BAD";
	}
	return 0;
}

/**************************************************************
	Problem: 1035
	User: huangcanwu
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/