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

/**************************************************************
	Problem: 1035
	User: ljl2
	Language: C
	Result: Compile Error
****************************************************************/