#include<bits/stdc++.h>
using namespace std;
int a;
int main(){
	int a;
	cin>>a;	
	if(a>=86){ 	
	cout<<"VERY GOOD";	
	}else if(a>=60){
	cout<<"GOOD";	
	}else if(a<60){
	cout<<"BAD";
	}
	return 0;
}
/**************************************************************
	Problem: 1035
	User: huanghao
	Language: C++
	Result: Accepted
	Time:36 ms
	Memory:2072 kb
****************************************************************/