#include<bits/stdc++.h>
using namespace std;
int main(){
		int n;
	cin>>n;
	if(n>60){
	if(n>=86)
		cout<<"VERY GOOD"<<endl;
		else cout<<"GOOD"<<endl;
	}
	
	if (n<60)cout<<"BAD";
	 
	
	
	return 0;
}
	
		
	
/**************************************************************
	Problem: 1035
	User: wengsihan
	Language: C++
	Result: Wrong Answer
****************************************************************/