C# Data Types - Speed Of Light

using System;
namespace DataBytes___Lab
{
    class Program
    {
        static void Main(string[] args)
        {
            decimal lightYears = decimal.Parse(Console.ReadLine());

            decimal lightYearToKm = 9450000000000m;
            decimal speedOfLight = 300000m;

            decimal totalKm = lightYears * lightYearToKm;
            decimal totalSeconds = totalKm / speedOfLight;
            decimal weeks = totalSeconds / 604800;
            decimal weeksLeftOver = totalSeconds % 604800;
            decimal days = weeksLeftOver / (60 * 60 * 24);
            decimal daysLeftOver = weeksLeftOver % (60 * 60 * 24);
            decimal hours = daysLeftOver / 3600;
            decimal hoursleftOver = daysLeftOver % 3600;
            decimal minutes = hoursleftOver / 60;
            decimal seconds = hoursleftOver % 60;

            Console.WriteLine($"{Math.Floor(weeks)} weeks");
            Console.WriteLine($"{Math.Floor(days)} days");
            Console.WriteLine($"{Math.Floor(hours)} hours");
            Console.WriteLine($"{Math.Floor(minutes)} minutes");
            Console.WriteLine($"{Math.Floor(seconds)} seconds");

            // Assume that 1 light year == 9 450 000 000 000 km.
            // Assume that the speed of light == 300 000 km / second.
        }
    }
}