#include <bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n>=86) cout<<"VERY GOOD";
	else if(n>=60&&n<=85) cout<<"GOOD";
	else cout<<"BAD";
}
/**************************************************************
	Problem: 1035
	User: wngjinming
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/