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

/**************************************************************
	Problem: 1035
	User: zhengzihao3
	Language: C++
	Result: Accepted
	Time:33 ms
	Memory:2072 kb
****************************************************************/