#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n>85) cout<<"VERY GOOD";
	else if(n<86&&n>59) cout<<"GOOD";
	else cout<<"BAD";
	
	return 0;
}

/**************************************************************
	Problem: 1035
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:24 ms
	Memory:2072 kb
****************************************************************/