using System;

namespace TradeCommissions
{
internal class Program
{
    static void Main(string[] args)
    {
        string city = Console.ReadLine();
        double sales = double.Parse(Console.ReadLine());

        if (city == "Sofia")
        {
            if (sales >= 0 && sales <= 500)
            {
                sales *= 0.05;
                Console.WriteLine($"{sales:F2}");
            }
            else if (sales > 500 && sales <= 1_000)
            {
                sales *= 0.07;
                Console.WriteLine($"{sales:F2}");
            }
            else if (sales > 1_000 && sales <= 10_000)
            {
                sales *= 0.08;
                Console.WriteLine($"{sales:F2}");
            }
            else if (sales > 10_000)
            {
                sales *= 0.12;
                Console.WriteLine($"{sales:F2}");
            }
            else
            {
                Console.WriteLine("error");
            }
        }
        else if (city == "Varna")
        {
            if (sales >= 0 && sales <= 500)
            {
                sales *= 0.045;
                Console.WriteLine($"{sales:F2}");
            }
            else if (sales > 500 && sales <= 1_000)
            {
                sales *= 0.075;
                Console.WriteLine($"{sales:F2}");
            }
            else if (sales > 1_000 && sales <= 10_000)
            {
                sales *= 0.1;
                Console.WriteLine($"{sales:F2}");
            }
            else if (sales > 10_000)
            {
                sales *= 0.13;
                Console.WriteLine($"{sales:F2}");
            }
            else
            {
                Console.WriteLine("error");
            }
        }
        else if (city == "Plovdiv")
        {
            if (sales >= 0 && sales <= 500)
            {
                sales *= 0.055;
                Console.WriteLine($"{sales:F2}");
            }
            else if (sales > 500 && sales <= 1_000)
            {
                sales *= 0.08;
                Console.WriteLine($"{sales:F2}");
            }
            else if (sales > 1_000 && sales <= 10_000)
            {
                sales *= 0.12;
                Console.WriteLine($"{sales:F2}");
            }
            else if (sales > 10_000)
            {
                sales *= 0.145;
                Console.WriteLine($"{sales:F2}");
            }
            else
            {
                Console.WriteLine("error");
            }
        }
        else
        {
            Console.WriteLine("error");
        }
    }
}
}