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

namespace ConsoleApp22
{
    class Program
    {
        static void Main(string[] args)
        {
            string city = Console.ReadLine().ToLower();
            double sales = double.Parse(Console.ReadLine());
            double commision = -1;
            if (city=="sofia")
            {
                if (sales >= 0 && sales <= 500)
                    commision = 0.05;
                else if (sales > 500 && sales <= 1000)
                    commision = 0.07;
                else if (sales > 1000 && sales <= 10000)
                    commision = 0.08;
                else if (sales > 10000)
                    commision = 0.12;
            }
            else if (city == "varna")
            {
                if (sales >= 0 && sales <= 500)
                    commision = 0.045;
                else if (sales > 500 && sales <= 1000)
                    commision = 0.075;
                else if (sales > 1000 && sales <= 10000)
                    commision = 0.10;
                else if (sales > 10000)
                    commision = 0.13;
            }
            else if (city == "plovdiv")
            {
                if (sales >= 0 && sales <= 500)
                    commision = 0.055;
                else if (sales > 500 && sales <= 1000)
                    commision = 0.08;
                else if (sales > 1000 && sales <= 10000)
                    commision = 0.12;
                else if (sales > 10000)
                    commision = 0.145;
            }
            if(commision>=0)
                Console.WriteLine("{0:f2}", sales*commision);
            else
                Console.WriteLine("error");
        }
    }
}