TradeCommissions

namespace TradeCommissions
{
    using System;

    class TradeCommissions
    {
        static void Main()
        {
            string city = Console.ReadLine().ToLower();
            var qty = double.Parse(Console.ReadLine());

            if (qty < 0 || !((city == "sofia") || (city == "varna") || (city == "plovdiv")))
            {
                Console.WriteLine("error");
            }

            double commission = 0.0;

            switch (city)
            {
                case "sofia":
                    if (qty <= 500)
                    {
                        commission = 5;
                    }
                    else if (qty <= 1000)
                    {
                        commission = 7;
                    }
                    else if (qty <= 10000)
                    {
                        commission = 8;
                    }
                    else
                    {
                        commission = 12;
                    }
                    break;

                case "varna":
                    if (qty <= 500)
                    {
                        commission = 4.5;
                    }
                    else if (qty <= 1000)
                    {
                        commission = 7.5;
                    }
                    else if (qty <= 10000)
                    {
                        commission = 10;
                    }
                    else
                    {
                        commission = 13;
                    }
                    break;

                case "plovdiv":
                    if (qty <= 500)
                    {
                        commission = 5.5;
                    }
                    else if (qty <= 1000)
                    {
                        commission = 8;
                    }
                    else if (qty <= 10000)
                    {
                        commission = 12;
                    }
                    else
                    {
                        commission = 14.5;
                    }
                    break;

                default:
                    break;
            }

            Console.WriteLine("{0:f2}", qty * commission / 100);
        }
    }
}