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





	return 0;
}

/**************************************************************
	Problem: 1035
	User: 21A
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/