using System;

​

public class Program

{

    public static void Main()

    {

        PrintInWords(double.Parse(Console.ReadLine()));

    }

​

    static void PrintInWords(double grade)

    {

        string gradeInWords = "Грешно число";

        if (grade >= 2 && grade <= 2.99)

            gradeInWords = "Слаб";

        else    

        if (grade >= 3 && grade <= 3.49)

            gradeInWords = "Среден";

        else    

        if (grade >= 3.50 && grade <= 4.49)

            gradeInWords = "Добър";

        else    

        if (grade >= 4.50 && grade <= 5.49)

            gradeInWords = "Много Добър";

        else    

        if (grade >= 5.50 && grade <= 6)

            gradeInWords = "Отличен";

        Console.WriteLine(gradeInWords);

    } 

}

​