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

namespace ConsoleApp19
{
    class Program
    {
        static void Main(string[] args)
        {
            string town = Console.ReadLine().ToLower();
            string product = Console.ReadLine().ToLower();
            double quantity = double.Parse(Console.ReadLine());

            if (town=="sofia")
            {
                if (product=="coffee") Console.WriteLine(0.50 * quantity);
                else if (product=="water") Console.WriteLine(0.80 * quantity);
                else if (product=="beer") Console.WriteLine(1.20 * quantity);
                else if (product== "sweets") Console.WriteLine(1.45 * quantity);
                else if (product=="peanuts") Console.WriteLine(1.60 * quantity);

            }
            if (town=="plovdiv")

            {
                if (product == "coffee") Console.WriteLine(0.40 * quantity);
             else if (product == "water") Console.WriteLine(0.70 * quantity);
       else if (product == "beer") Console.WriteLine(1.15 * quantity);
            else if (product == "sweets") Console.WriteLine(1.30 * quantity);
            else if (product == "peanuts") Console.WriteLine(1.50 * quantity);
            }
           if (town=="varna")
            {
                if (product == "coffee") Console.WriteLine(0.45 * quantity);
                else if (product == "water") Console.WriteLine(0.70 * quantity);
                else if (product == "beer") Console.WriteLine(1.10 * quantity);
                else if (product == "sweets") Console.WriteLine(1.35 * quantity);
                else if (product == "peanuts") Console.WriteLine(1.55 * quantity);
            }
            else { Console.WriteLine("Not valid!"); }
        }
    }
}