#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n>=86){
		cout<<"VERY GOOD"<<endl;
	}else if(n>=60){
		cout<<"GOOD"<<endl;
	}else{
		cout<<"BAD"<<endl;
	}
	
}
/**************************************************************
	Problem: 1035
	User: zhuangsongyu
	Language: C++
	Result: Accepted
	Time:31 ms
	Memory:2072 kb
****************************************************************/