using System;

namespace ConsoleApp27
{
    class Program
    {
        static void Main(string[] args)
        {
            int lostGames = int.Parse(Console.ReadLine());
            double headSetPrice = Double.Parse(Console.ReadLine());
            double mousePrice = Double.Parse(Console.ReadLine());
            double keyboardPrice = Double.Parse(Console.ReadLine());
            double DisplayPrice = Double.Parse(Console.ReadLine());
            double fullPrice = 0;
            for (int i = 2; i <= lostGames; i += 2)
            {
                fullPrice += headSetPrice;
            }
            double firstTurn = fullPrice;
            for (int j = 3; j <= lostGames; j += 3)
            {
                fullPrice += mousePrice;
            }
            double secondTurn = fullPrice;
            // ako e delimo na tri znachi si e chupil i klaviaturata znachi

            for (int i = 1; i <= lostGames; i++)
            {
                if (i % 2 == 0 && i % 3 == 0)
                {


                    if (fullPrice - (keyboardPrice * 2) == secondTurn)
                    {
                        fullPrice += DisplayPrice;

                    }
                    fullPrice += keyboardPrice;
                }
            }


            Console.WriteLine(fullPrice);
        }
    }
}