using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("a=");

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

        if(a<7 && a>=5.50)

        {

            Console.WriteLine("otlichen");

        }

            else if(a<5.50 && a>=4.50)

            {

                Console.WriteLine("mnogo dobar");

            }

            else if(a<4.50 && a>=3.50)

            {

                Console.WriteLine("dobar");

            }

        else if(a<3.50 && a>=3)

        { 

            Console.WriteLine("sreden");

        }

        else if(a<3 && a>=2)

        {

            Console.WriteLine("slab");

        }

                else

                {

                    Console.WriteLine("nqma takava ocenka");

                }

    }

}