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