using System;

public class Program

{

    public static void Main()

    {

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

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

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

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

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

        double sumCake = cakes*45;

        double sumVaffels = vaffels*5.80;

        double sumPancakes = pancakes*3.20;

        double daySum = (sumCake + sumVaffels + sumPancakes)*workers;

        double campaignSum = daySum * days ;

        double finalSum = campaignSum-( campaignSum*1/8 );

        Console.WriteLine($"{finalSum:f2}");

    }

}