Exam 2. Bits Up

namespace _5.BitsUp
{
    using System;

    public class SetTo1TheBitsAtGivenPositionsInByteSequence
    {
        public static void Main(string[] args)
        {
            checked
            {
                int countN = int.Parse(Console.ReadLine());
                int step = int.Parse(Console.ReadLine());
                byte[] bytes = ReadNumbersFromInputAndWriteThemInArray(countN);
                int indexInSequence = 0;
                for (int i = 0; i < bytes.Length; i++)
                {
                    byte num = bytes[i];
                    for (int bit = 7; bit >= 0; bit--)
                    {
                        if ((indexInSequence % step == 1) || (step == 1 && indexInSequence > 0))
                        {
                            num |= (byte)(1 << bit);
                        }

                        indexInSequence++;
                    }

                    Console.WriteLine(num);
                }
            }
        }

        private static byte[] ReadNumbersFromInputAndWriteThemInArray(int count)
        {
            byte[] arr = new byte[count];
            for (int i = 0; i < arr.Length; i++)
            {
                arr[i] = byte.Parse(Console.ReadLine());
            }

            return arr;
        }
    }
}