#include<stdio.h>   

int main(){ 
	int a;
	
	scanf("%d",&a);
	
	if(a >= 86){
		printf("VERY GOOD");
	}else if(a >= 60 && a <= 85){
		printf("GOOD");
	}else{
		printf("BAD");
	}

	return 0;
} 
/**************************************************************
	Problem: 1035
	User: admin
	Language: C
	Result: Accepted
	Time:31 ms
	Memory:1144 kb
****************************************************************/