namespace TradeComissions
{
    using System;
    public class Program
    {
        public static void Main()
        {
            string city = Console.ReadLine().ToLower();
            decimal money = decimal.Parse(Console.ReadLine());
            decimal result = 0.0m;

            switch (city)
            {
                case "sofia":
                    if (money >= 0 && money <= 500)
                    {
                        result = money * 0.05m;
                    }
                    else if (money > 500 && money <= 1000)
                    {
                        result = money * 0.07m;
                    }
                    else if (money > 1000 && money <= 10000)
                    {
                        result = money * 0.08m;
                    }
                    else if (money > 10000)
                    {
                        result = money * 0.12m;
                    }
                    break;

                case "plovdiv":
                    if (money >= 0 && money <= 500)
                    {
                        result = money * 0.055m;
                    }
                    else if (money > 500 && money <= 1000)
                    {
                        result = money * 0.08m;
                    }
                    else if (money > 1000 && money <= 10000)
                    {
                        result = money * 0.12m;
                    }
                    else if (money > 10000)
                    {
                        result = money * 0.145m;
                    }
                    break;

                case "varna":
                    if (money >= 0 && money <= 500)
                    {
                        result = money * 0.045m;
                    }
                    else if (money > 500 && money <= 1000)
                    {
                        result = money * 0.075m;
                    }
                    else if (money > 1000 && money <= 10000)
                    {
                        result = money * 0.1m;
                    }
                    else if (money > 10000)
                    {
                        result = money * 0.13m;
                    }
                    break;

            }
            if (result != 0)
            {
                Console.WriteLine("{0:f2}", result);
            }
            else
            {
                Console.WriteLine("error");
            }
        }

    }

}