Смяна на плочки ; Change Tiles

using System;

namespace tESt
{
    class Program
    {
        static void Main(string[] args)

        {
            var money = double.Parse(Console.ReadLine());

            var sideFloorA = double.Parse(Console.ReadLine());
            var sideFloorB = double.Parse(Console.ReadLine());

            var sideTriang = double.Parse(Console.ReadLine());
            var highTriang = double.Parse(Console.ReadLine());

            var priceTile = double.Parse(Console.ReadLine());
            var priceWork = double.Parse(Console.ReadLine());


            var floorArea = sideFloorA * sideFloorB;  // floor aria sq.m.
            var triangArea = sideTriang * highTriang / 2.0;  // triangle aria sq.m.

            var nececeryTiles = (floorArea / triangArea + 5.0);
            nececeryTiles = Math.Ceiling(nececeryTiles);

            var lastPrice = nececeryTiles * priceTile + priceWork;

            var diff = money - lastPrice;


            if (diff > 0)
            {
                Console.WriteLine($"{diff:f2} lv left.");
            }
            else
            {
                diff = Math.Abs(diff);
                Console.WriteLine($"You'll need {diff:f2} lv more.");
            }
        }
    }
}