Pool Day

using System;

namespace PoolDay
{
    class Program
    {
        static void Main(string[] args)
        {
            double people = double.Parse(Console.ReadLine());
            double entrance = double.Parse(Console.ReadLine());
            double deskChair = double.Parse(Console.ReadLine());
            double umbrella = double.Parse(Console.ReadLine());

            double entrancePrice = people * entrance;
            double deskChairPrice = Math.Ceiling(people * 0.75) * deskChair;
            double umbrellaPrice = Math.Ceiling(people / 2) * umbrella;

            Console.WriteLine($"{entrancePrice + deskChairPrice + umbrellaPrice:F2} lv.");

        }
    }
}