using System;

public class Program

{

    public static void Main()

    {

    var town = Console.ReadLine().ToLower();

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

    double bonus = 0;

    double percent = 0;

        if (town == "sofia")

        {

            if (sales >= 0 && sales <= 500)

            {

                percent = 5;

                bonus = (5 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else if (sales > 500 && sales >= 1000)

            {

                percent = 7;

                bonus = (7 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else if (sales > 1000 && sales <= 10000)

            {

                percent = 8;

                bonus = (8 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else if (sales >= 10000)

            {

                percent = 12;

                bonus = (12 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else

            {

                Console.WriteLine("error");

            }

        }

        else if (town == "varna")

        {

            if (sales >=0 && sales <= 500)

            {

                percent = 4.5;

                bonus = (4.5 / 100) * sales;

                Console.WriteLine("{o.f2}", bonus);

            }

            else if (sales > 500 && sales <= 1000)

            {

                percent = 7.5;

                bonus = (7.5 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else if (sales > 1000 && sales <= 10000)

            {

                percent = 10;

                bonus = (10 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else if (sales > 10000)

            {

                percent = 13;

                bonus = (13 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else 

            {

                Console.WriteLine("error");

            }

        }

        else if (town == "plovdiv")

        {

            if (sales >= 0 && sales <= 500)

            {

                percent = 5.5;

                bonus = (5.5 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else if (sales > 500 && sales <= 1000)

            {

                percent = 8;

                bonus = (8 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else if (sales >1000 && sales <= 10000)

            {

                percent = 12;

                bonus = (12 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else if (sales > 10000)

            {

                percent = 14.5;

                bonus = (14.5 / 100) * sales;

                Console.WriteLine("{0.f2}", bonus);

            }

            else 

            {

                Console.WriteLine("error");

            }

        }

        else

        {

            Console.WriteLine()ne()ne("error");

        }

    }

}