26.Wave Bits-мое решение

using System;
class WaveBits
{
    static void Main()
    {
        ulong N = ulong.Parse(Console.ReadLine());

        bool isFindSeq = false, isStartIndex = true;
        int counter = 1, bestCounter = 0, startDelete = 0, otherStartDelete = 0;
        for (int i = 64; i >= 0; i--)
        {
            if((N & ((ulong)1 << i)) != 0 && (N & ((ulong)1 << i - 1)) == 0
                && (N & ((ulong)1 << i - 2)) != 0)
            {
                counter += 2;
                if(isStartIndex)
                {
                    isStartIndex = false;
                    startDelete = i;
                }
                i--;
            }
            if(i == 0 && bestCounter > counter)
            {
                startDelete = otherStartDelete;
            }
            else if((N & ((ulong)1 << i)) != 0 && !(isFindSeq) && counter > 1)
            {
                if (bestCounter <= counter)
                {
                    bestCounter = counter;
                    isStartIndex = true;
                    otherStartDelete = startDelete;
                }
                counter = 1;
            }
        }
        if(bestCounter == 0)
        {
            Console.WriteLine("No waves found!");
            return;
        }
        string newNumber = null;
        for (int i = 63; i >= 0; i--)
        {
            if(i  == startDelete)
            {
                i++;
                while(bestCounter > 0)//пор този начин не броя намерената редица
                {
                    bestCounter--;
                    i--;
                }
            }
            else if((N & ((ulong)1 << i)) != 0)
            {
                newNumber += '1';
            }
            else if((N & ((ulong)1 << i)) == 0)
            {
                newNumber += '0';
            }
        }
        Console.WriteLine(Convert.ToUInt64(newNumber, 2));
    }
}