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

/**************************************************************
	Problem: 1035
	User: lijinkai
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/