using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace zad_8
{
    class Program
    {
        static void Main(string[] args)
        {
            string town = Console.ReadLine().ToLower();
            double sales = double.Parse(Console.ReadLine());
            double comissions = -1.0;

            if (town == "sofia")
            {
                if (0 <= sales && sales <= 500) comissions = 0.05;
                else if (500 < sales && sales <= 1000) comissions = 0.07;
                else if (1000 < sales && sales <= 10000) comissions = 0.08;
                else if (sales > 10000) comissions = 0.12;


            }
            else if (town == "varna")
            {
                if (0 <= sales && sales <= 500) comissions = 0.45;
                else if (500 <= sales && sales <= 1000) comissions = 0.075;
                else if (1000 < sales && sales <= 10000) comissions = 0.1;
                else if (sales > 10000) comissions = 0.13;


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

            }
            if (sales > 0)
            {
                Console.WriteLine("{0:f2}", sales * comissions);
            }
            else
            {
                Console.WriteLine("error");
            }
        }
    }
}