BeerStockProblem

using System;
class BeerStock
{
    static void Main(string[] args)
    {
        int reservedBeers = int.Parse(Console.ReadLine());
        string shipment = Console.ReadLine();
        double totalAmountBeers = 0;

        while (shipment != "Exam Over")
        {
            string typeBeer;
            int quantity;
            string[] beerArray = shipment.Split(' ');
            typeBeer = beerArray[1];
            quantity = int.Parse(beerArray[0]);
            switch (typeBeer)
            {
                case "beers":
                    totalAmountBeers += quantity;
                    break;
                case "cases":
                    totalAmountBeers += quantity * 24;
                    break;
                case "sixpacks":
                    totalAmountBeers += quantity * 6;
                    break;
            }
            shipment = Console.ReadLine();
        }
        if (totalAmountBeers % 100 >= 0)
        {
            totalAmountBeers = totalAmountBeers - Math.Floor(totalAmountBeers / 100);
        }
        if (totalAmountBeers < reservedBeers)
        {
            double totalBeersNeeded = reservedBeers - totalAmountBeers;
            double casesNeeded = Math.Floor((totalBeersNeeded / 24));
            double sixpacksNeeded = Math.Floor((totalBeersNeeded -(casesNeeded*24)) / 6);
            double beersNeeded = totalBeersNeeded - casesNeeded*24 - sixpacksNeeded*6;
            Console.WriteLine("Not enough beer. Beer needed: {0} cases, {1} sixpacks and {2} beers.",
                (casesNeeded), (sixpacksNeeded), (beersNeeded));
        }
        else
        {
            double totalBeerLeft = totalAmountBeers - reservedBeers;
            double casesLeft = Math.Floor((totalBeerLeft / 24));
            double sixpacksLeft = Math.Floor((totalBeerLeft - (casesLeft)*24) / 6);
            double beersLeft = totalBeerLeft - casesLeft*24 - sixpacksLeft*6;
            Console.WriteLine("Cheers! Beer left: {0} cases, {1} sixpacks and {2} beers.",
                (casesLeft), (sixpacksLeft), (beersLeft));
        }
    }
}