using System;

public class Program

{

    public static void Main()

    {

        int x;

        Console.Write("Enter Score");

        x=Int32.Parse(Console.ReadLine());

        if (x>80) {

            Console.WriteLine("Excellemt");

        }

        else if (x>=70) {

            Console.WriteLine("Good");

        }

        else if (x>=60) {

            Console.WriteLine("OK");

        }

        else {

            Console.WriteLine("Improve");

        }

    }

}