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

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