using System;

​

public class Program

{

    public static void Main()

    {

        int days = int.Parse(Console.ReadLine());

        int people = int.Parse(Console.ReadLine());

        int cakes = int.Parse(Console.ReadLine());

        int waffles = int.Parse(Console.ReadLine());

        int pancakes = int.Parse(Console.ReadLine());

        double sum = ((cakes * 45) + (waffles * 5.80) + (pancakes * 3.20)) * days * people * 7 / 8;

        Console.WriteLine("{0:F2} лева", sum);

    }

}