using System;

public class Program

{

    public static void Main()

    {

        var a = double.Parse(Console.ReadLine());

        if ( a<2) Console.WriteLine("Ne e ocenka");

        else if ( a>6) Console.WriteLine("Ne e ocenka");

        else if ( a >= 2 && a < 3) Console.WriteLine("Slab");

        else if ( a>= 3 && a < 3.5) Console.WriteLine("Sreden");

        else if (a>=3.5 && a<4.5) Console.WriteLine("Dobar");

        else if (a>=4.5 && a<5.5) Console.WriteLine(" Mnogo Dobar");

        else Console.WriteLine("Otlichen");

        }

}