10. Rage Expenses

using System;

namespace RageExpenses
{
    class Program
    {
        static void Main(string[] args)
        {
            int lost = int.Parse(Console.ReadLine());
            double headset = double.Parse(Console.ReadLine());
            double mouse = double.Parse(Console.ReadLine());
            double keyboard = double.Parse(Console.ReadLine());
            double display = double.Parse(Console.ReadLine());
            double headsetC = 0;
            double mouseC = 0;
            double keyboardC = 0;
            double displayC = 0;

            for (int i = 1; i <= lost; i++)
            {

                if (i % 2 == 0)
                {
                    headsetC++ ;
                }

                if (i % 3 == 0)
                {
                    mouseC++;
                }

                if (i % 2 == 0 && i % 3 == 0)
                {
                    keyboardC++;
                    if (keyboardC % 2 == 0)
                    {
                        displayC++;
                    }
                }
            }
            double expenses = headset * headsetC + mouse * mouseC + keyboard * keyboardC + display * displayC;
            Console.WriteLine($"Rage expenses: {expenses:F2} lv.");
        }
    }
}