#include<bits/stdc++.h>
using namespace std;
long int n;
string a="VERY GOOD";
string b="GOOD";
string c="BAD";
int main(){
	cin>>n;
	if(n>=86) cout<<a;
	else if(n>=60&&n<=85) cout<<b;
	else if(n<60) cout<<c;
	return 0;
}
/**************************************************************
	Problem: 1035
	User: zengdongxin
	Language: C++
	Result: Accepted
	Time:24 ms
	Memory:2072 kb
****************************************************************/