using System;

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

            double percent = 0;
            if (city == "Sofia")
            {
                if (salesVolume >= 0 && salesVolume <= 500)
                {
                    percent = 0.05 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
                else if (salesVolume > 500 && salesVolume <= 1000)
                {
                    percent = 0.07 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
                else if (salesVolume > 1000 && salesVolume <= 10000)
                {
                    percent = 0.08 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
                else if (salesVolume > 10000)
                {
                    percent = 0.12 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
else
            {
                Console.WriteLine("error");
            }


            }

            else if (city == "Varna")
            {
                if (salesVolume >= 0 && salesVolume <= 500)
                {
                    percent = 0.045 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
                else if (salesVolume > 500 && salesVolume <= 1000)
                {
                    percent = 0.075 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
                else if (salesVolume > 1000 && salesVolume <= 10000)
                {
                    percent = 0.10 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
                else if (salesVolume > 10000)
                {
                    percent = 0.13 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
else
            {
                Console.WriteLine("error");
            }

            }
            else if (city == "Plovdiv")
            {
                if (salesVolume >= 0 && salesVolume <= 500)
                {
                    percent = 0.055 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
                else if (salesVolume > 500 && salesVolume <= 1000)
                {
                    percent = 0.080 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
                else if (salesVolume > 1000 && salesVolume <= 10000)
                {
                    percent = 0.12 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
                else if (salesVolume > 10000)
                {
                    percent = 0.145 * salesVolume;
 Console.WriteLine($"{percent:F2}");
                }
else
            {
                Console.WriteLine("error");
            }

            }
            else
            {
                Console.WriteLine("error");
            }




        }
    }
}