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

/**************************************************************
	Problem: 1035
	User: yangjunwen
	Language: C++
	Result: Compile Error
****************************************************************/