#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{
   	cout<<"BAD";
   }
    return 0;
}
/**************************************************************
	Problem: 1035
	User: wangyousi
	Language: C++
	Result: Accepted
	Time:47 ms
	Memory:2072 kb
****************************************************************/