Exam July Morning 5. Bit Paths

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

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

            int[] rowNums = new int[8];
            for (int i = 0; i < countOfPaths; i++)
            {
                string inputLine = Console.ReadLine();
                string[] numStr = inputLine.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
                int startBitPosition = 3 - int.Parse(numStr[0]);
                int bitValue = (rowNums[0] >> startBitPosition) & 1;
                if (bitValue == 0)
                {
                    rowNums[0] |= 1 << startBitPosition;
                }
                else
                {
                    int bitMask = 1 << startBitPosition;
                    rowNums[0] &= ~bitMask;
                }

                int previousPos = startBitPosition;
                for (int row = 1; row < rowNums.Length; row++)
                {
                    int number = rowNums[row];
                    int bitPosition = previousPos + ((-1) * int.Parse(numStr[row]));
                    bitValue = (number >> bitPosition) & 1;
                    if (bitValue == 0)
                    {
                        rowNums[row] = number | (1 << bitPosition);
                    }
                    else
                    {
                        int bitMask = 1 << bitPosition;
                        rowNums[row] = number & ~bitMask;
                    }

                    previousPos = bitPosition;
                }
            }

            int sumNums = 0;
            foreach (int num in rowNums)
            {
                sumNums += num;
            }

            string binaryNum = Convert.ToString(sumNums, 2);

            Console.WriteLine(binaryNum);
            Console.WriteLine("{0:X}", sumNums);
        }
    }
}