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

/**************************************************************
	Problem: 1035
	User: huangcanwu
	Language: C++
	Result: Wrong Answer
****************************************************************/