using System;

public class Program

{

    public static void Main()

    {

        /*

        Console.WriteLine("how mach time left? (sec)");

        int time = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("hour left: " + time/360);

        Console.WriteLine("minits left: " + (time%360)/60);

        Console.WriteLine("seconds left: " + time%60);

        //

        Console.WriteLine("enter a 2 digit number");

        int num = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine(num/10);

        Console.WriteLine(num%10);

        //

        Console.WriteLine("enter a 3 digits number");

        int num = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine(num/100);

        Console.WriteLine((num%100)/10);

        Console.WriteLine(num%10);

        //

        Console.WriteLine("enter a 4 digits number");

        int num = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine(num/1000);

        Console.WriteLine((num%1000)/100);

        Console.WriteLine((num%100)/10);

        Console.WriteLine(num%10);

        //

        Console.WriteLine("enter a 5 digits number");

        int num = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine(num/10000);

        Console.WriteLine((num%10000)/1000);

        Console.WriteLine((num%1000)/100);

        Console.WriteLine((num%100)/10);

        Console.WriteLine(num%10);

        //

        Console.WriteLine("enter a 3 digits number");

        int num = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine(num%10);

        Console.WriteLine((num%100)/10);

        Console.WriteLine(num/100);

        */

        Console.WriteLine("enter a grade");

        int grade = Convert.ToInt32(Console.ReadLine());

        if (grade<0 && grade>100){

            Console.WriteLine("not within range");

        } else if (grade>90){

            Console.WriteLine("excellent");

        } else if (grade>80){

            Console.WriteLine("good");

        } else if (grade>70){

            Console.WriteLine("fairly good");

        } else if (grade>60){

            Console.WriteLine("enough");

        } else{Console.WriteLine("failed");

             }   

    }

}