using System;

namespace Point_in_Rectangle
{
   public class Program
    {
       public static void Main()
        {
            var town = Console.ReadLine();
            var sales = double.Parse(Console.ReadLine());
            var commissions = 0.00;

            if (town == "Sofia")
            {
                if (0 <= sales && sales <= 500) commissions = 0.05;
                else if (500 <= sales && sales <= 1000) commissions = 0.07;
                else if (1000 <= sales && sales <= 10000) commissions = 0.08;
                else if (sales >= 10000) commissions = 0.12;
            }
            else if (town == "Varna")
            {
                if (0 <= sales && sales <= 500) commissions = 0.045;
                else if (500 <= sales && sales <= 1000) commissions = 0.075;
                else if (1000 <= sales && sales <= 10000) commissions = 0.10;
                else if (sales >= 10000) commissions = 0.13;
            }
            else if (town == "Plovdiv")
            {
                if (0 <= sales && sales <= 500) commissions = 0.055;
                else if (500 <= sales && sales <= 1000) commissions = 0.08;
                else if (1000 <= sales && sales <= 10000) commissions = 0.12;
                else if (sales >= 10000) commissions = 0.145;
            }
            if (commissions > 0)
            {
                Console.WriteLine("{0:f2}", (commissions * sales));
            }
            else
            {
                Console.WriteLine("error");
            }
        }

        }
    }