charityCampaign_SoftUni

using System;

namespace softuni1
{
    class Program
    {
        static void Main(string[] args)
        {
            //input
            int days = int.Parse(Console.ReadLine());
            int chefs = int.Parse(Console.ReadLine());
            int cakes = int.Parse(Console.ReadLine());
            int waffles = int.Parse(Console.ReadLine());
            int pancakes = int.Parse(Console.ReadLine());
            //calculation
            int cakesSum = cakes * 45;
            double wafflesSum = waffles * 5.80;
            double pancakesSum = pancakes * 3.20;

            double sumForOneDay = (cakesSum + wafflesSum + pancakesSum) * chefs;
            double company = sumForOneDay * days;
            double total = company - (company / 8);
            Console.WriteLine(total);



        }

    }
}