using System;

namespace CharityCampaign
{
    class Program
    {
        static void Main(string[] args)
        {
            int days = int.Parse(Console.ReadLine());
            int confectioners = int.Parse(Console.ReadLine());
            int cackes = int.Parse(Console.ReadLine());
            int wafers = int.Parse(Console.ReadLine());
            int pancakes = int.Parse(Console.ReadLine());
            int caceOnePrice = 45;
            double waferOnePrice = 5.80;
            double pancakesOnePrice = 3.20;
            double cackesTotalPrice = cackes * caceOnePrice;
            double wafersTotalPrice = wafers * waferOnePrice;
            double pancakesTotalPrice = pancakes * pancakesOnePrice;
            double priceOneDay = cackesTotalPrice + wafersTotalPrice + pancakesTotalPrice * confectioners;
            double priceHoleCompany = priceOneDay * 20;
            double priceAfterCosts = priceHoleCompany - 1/8;
            Console.WriteLine ($"{priceAfterCosts:F2}");



        }
    }
}