BandMembers

using System;

namespace _1.BandMembers
{
    class Program
    {
        static void Main(string[] args)
        {
            int memebersCount = int.Parse(Console.ReadLine());
            int guitaristsCount = memebersCount / 3;
            int drummersCount = memebersCount - 1 - guitaristsCount;
            decimal guitarPrice = decimal.Parse(Console.ReadLine());
            decimal drumPrice = guitarPrice + 0.5M * guitarPrice;
            decimal microphonePriceExspences = Math.Abs(drumPrice*drummersCount-guitarPrice*guitaristsCount);
            decimal guitarExpences = guitarPrice * guitaristsCount;
            decimal drumsExpences = drummersCount * drumPrice;
            decimal pricePerRent = (guitarExpences+drumsExpences+microphonePriceExspences)/memebersCount;
            decimal totalRentExpences = 12 * pricePerRent;
            decimal totalCost = drumsExpences + guitarExpences + microphonePriceExspences + totalRentExpences;
            Console.WriteLine($"Total cost: {totalCost:f2}lv.");
        }
    }
}