Exam July Morning 1. Melons and Watermelons

using System;
using System.Globalization;
using System.Threading;

public class MelonsAndWatermelons
{
    public static void Main()
    {
        Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
        checked
        {
            int startDay = int.Parse(Console.ReadLine());
            int amountOfDays = int.Parse(Console.ReadLine());

            int melons = 0;
            int watermelons = 0;
            if (amountOfDays > 0)
            {
                for (int i = startDay; i < (startDay + amountOfDays); i++)
                {
                    int dayOfWeek = (i % 7);
                    switch (dayOfWeek)
                    {
                        case 1:
                            watermelons++;
                            break;
                        case 2:
                            melons += 2;
                            break;
                        case 3:
                            melons++;
                            watermelons++;
                            break;
                        case 4:
                            watermelons += 2;
                            break;
                        case 5:
                            melons += 2;
                            watermelons += 2;
                            break;
                        case 6:
                            melons += 2;
                            watermelons++;
                            break;
                        default:
                            break;
                    }
                }
            }

            if (melons == watermelons)
            {
                Console.WriteLine("Equal amount: {0}", melons);
            }
            else
            {
                if (melons > watermelons)
                {
                    int diff = melons - watermelons;
                    Console.WriteLine("{0} more melons", diff);
                }
                else
                {
                    int diff = watermelons - melons;
                    Console.WriteLine("{0} more watermelons", diff);
                }
            }
        }
    }
}