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

/**************************************************************
	Problem: 1035
	User: chenzelin
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2072 kb
****************************************************************/