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

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