import java.util.Scanner;
public class Zadaca {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();

        int prosek  =  (a + b + c) / 3;

        if(prosek >= 85) {
            System.out.println("Prosek: " + prosek + " excellent");
        }
        else if(prosek >= 70 && prosek < 85) {
            System.out.println("Prosek: " + prosek + " good");
        }
        else if(prosek >= 50 && prosek < 70) {
            System.out.println("Prosek: " + prosek + " average");
        }
        else if(prosek < 50) {
            System.out.println("Prosek: " + prosek + " poor");
        }

    }

}