using System;

namespace _6TradeCommission
{
    class Program
    {
        static void Main(string[] args)
        {
            string city = Console.ReadLine();
            int sales = int.Parse(Console.ReadLine());
            double commission = 1.0;

            if (city == "sofia")
            {
                if (0 <= sales && sales <= 500)
                {
                    commission = 0.05;
                }
                else if (500 < sales && sales <= 1000)
                {
                    commission = 0.07;
                }
                else if (1000 < sales && sales <= 10000)
                {
                    commission = 0.08;
                }
                else if (10000 < sales)
                {
                    commission = 0.12;
                }

            }
            else if (city == "varna")
            {
                if (0 <= sales && sales <= 500)
                {
                    commission = 0.045;
                }
                else if (500 < sales && sales <= 1000)
                {
                    commission = 0.075;
                }
                else if (1000 < sales && sales <= 10000)
                {
                    commission = 0.1;
                }
                else if (10000 < sales)
                {
                    commission = 0.13;
                }

            }
            else if (city == "plovdiv")
            {
                if (0 <= sales && sales <= 500)
                {
                    commission = 0.055;
                }
                else if (500 < sales && sales <= 1000)
                {
                    commission = 0.08;
                }
                else if (1000 < sales && sales <= 10000)
                {
                    commission = 0.12;
                }
                else if (10000 < sales)
                {
                    commission = 0.145;
                }

            }
            else //нужен по конвенция последен elsе
            {
                commission = 0;
            }

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

        }
    }
}