namespace csharp
{

    class chapter2
    {
        static void Main(string[] args)
        {
            int[] Jan = new int[31];
            int[] Feb = new int[29];
            int[][] sales = new int[][] {Jan, Feb};
            int month, day, total;
            const int DaysOfWeek = 7;
            double average = 0.0;
            sales[0][0] = 41;
            sales[0][1] = 30;
            sales[0][2] = 23;
            sales[0][3] = 34;
            sales[0][4] = 28;
            sales[0][5] = 35;
            sales[0][6] = 45;
            sales[1][0] = 35;
            sales[1][1] = 37;
            sales[1][2] = 32;
            sales[1][3] = 26;
            sales[1][4] = 45;
            sales[1][5] = 38;
            sales[1][6] = 42;
            for (month = 0; month <= 1; month++)
            {
                total = 0;
                for (day = 0; day <= 6; day++)
                    total += sales[month][day];
                average = total / DaysOfWeek;
                Console.WriteLine("Average sales for month: " + month + ": " + average);
            }
            Console.ReadKey();
        }
    }
}