#include<iostream>

using namespace std;

int main(void)
{
    int n;
    cin>>n;
    
    if(n>=86){
        cout<<"VERY GOOD"<<endl;
    }else if(n>=60 and n<=85){
        cout<<"GOOD"<<endl;
    }else{
        cout<<"BAD"<<endl;
    }
    return 0;
}
/**************************************************************
	Problem: 1035
	User: 231308061
	Language: C++
	Result: Accepted
	Time:121 ms
	Memory:2072 kb
****************************************************************/