Bits Inverter Three

using System;
using System.Text;

class BitsInverterTwo
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int step = int.Parse(Console.ReadLine());
        int index = 0;

        var binNumber = new StringBuilder();
        for (int i = 0; i < n; i++)
        {
            binNumber.Append(Convert.ToString(int.Parse(Console.ReadLine()), 2).PadLeft(8, '0'));
            for (int j = 0; j < binNumber.Length; j++)
            {
                index++;
                if ((step == 1) || (index % step == 1))
                {
                    if (binNumber[j] == '0')
                    {
                        binNumber[j] = '1';
                    }
                    else
                    {
                        binNumber[j] = '0';
                    }
                }
            }

            int intResult = Convert.ToInt32(binNumber.ToString(), 2);
            Console.WriteLine(intResult);
            binNumber.Clear();
        }
    }
}