#include<bits/stdc++.h>
using namespace std;
int a;
int main(){
	  cin>>a;
	  if(a>=86)cout<<"VERY GOOD";
	  if(a>=60&&a<=85)cout<<"GOOD";
	  else cout<<"BAD";                            
	return 0;
}
/**************************************************************
	Problem: 1035
	User: chenjingqi
	Language: C++
	Result: Wrong Answer
****************************************************************/