Excursion

using System;

namespace Excursion
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int people = int.Parse(Console.ReadLine());
            int nights = int.Parse(Console.ReadLine());
            int cards = int.Parse(Console.ReadLine());
            int tickets = int.Parse(Console.ReadLine());

            double total = people * (nights * 20 + cards * 1.60 + tickets * 6) * 1.25;

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