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