using System;

namespace _9.TradeCommision
{
    class Program
    {
        static void Main(string[] args)
        {
            string town = Console.ReadLine();
            double sells = double.Parse(Console.ReadLine());
            double commision = 0;
            double value = 0;

            if (town == "Sofia")
            {
                if (sells >= 0 && sells <= 500)
                {
                    commision = 0.05;
                    value = sells * commision;
                }
                else if (sells > 500 && sells <= 1000)
                {
                    commision = 0.07;
                    value = sells * commision;
                }
                else if (sells > 1000 && sells <= 10000)
                {
                    commision = 0.08;
                    value = sells * commision;
                }
                else if (sells > 10000)
                {
                    commision = 0.12;
                    value = sells * commision;
                }
                else if (sells < 0)
                {
                    Console.WriteLine("error");
                }
            }
           else if (town == "Varna")
            {
                if (sells >= 0 && sells <= 500)
                {
                    commision = 0.045;
                    value = sells * commision;
                }
                else if (sells > 500 && sells <= 1000)
                {
                    commision = 0.075;
                    value = sells * commision;
                }
                else if (sells > 1000 && sells <= 10000)
                {
                    commision = 0.1;
                    value = sells * commision;
                }
                else if (sells > 10000)
                {
                    commision = 0.13;
                    value = sells * commision;
                }
                else if (sells < 0)
                {
                    Console.WriteLine("error");
                }
            }
            else if (town == "Plovdiv")
            {
                if (sells >= 0 && sells <= 500)
                {
                    commision = 0.055;
                    value = sells * commision;
                }
                else if (sells > 500 && sells <= 1000)
                {
                    commision = 0.08;
                    value = sells * commision;
                }
                else if (sells > 1000 && sells <= 10000)
                {
                    commision = 0.12;
                    value = sells * commision;
                }
                else if (sells > 10000)
                {
                    commision = 0.145;
                    value = sells * commision;
                }
                else if (sells < 0)
                {
                    Console.WriteLine("error");
                    Console.WriteLine();
                }

            }
            if (town != "Sofia" && town != "Varna" && town != "Plovdiv")
            {
                Console.WriteLine("error");
            }

            else
            {
                Console.WriteLine($"{value:f2}");
            }
            Console.WriteLine();

            //if (sells < 0)
            //{
            //    Console.WriteLine("error");
            //}


        }
    }
}