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

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