Exam 6. Bit Roller (String Solution)

namespace _5.BitRoller
{
    using System;

    public class BitRoller
    {
        public static void Main(string[] args)
        {
            checked
            {
                uint num = uint.Parse(Console.ReadLine());
                int frozenBit = int.Parse(Console.ReadLine());
                int timesR = int.Parse(Console.ReadLine());

                if (num != 0 && num != 524287)
                {
                    string inputBinaryStr = Convert.ToString(num, 2);
                    inputBinaryStr = inputBinaryStr.PadLeft(19, '0');

                    int indexFrozenBit = 18 - frozenBit;
                    string valueFrozenBit = inputBinaryStr[indexFrozenBit].ToString();

                    string binNumStr = string.Empty;
                    if (indexFrozenBit > 0)
                    {
                        binNumStr += inputBinaryStr.Substring(0, indexFrozenBit);
                    }

                    if (indexFrozenBit < 18)
                    {
                        binNumStr += inputBinaryStr.Substring(indexFrozenBit + 1);
                    }

                    for (int i = 0; i < timesR; i++)
                    {
                        binNumStr = binNumStr[17].ToString() + binNumStr.Remove(17);
                    }

                    string outputBinaryStr = binNumStr.Insert(indexFrozenBit, valueFrozenBit);

                    uint ouputNum = Convert.ToUInt32(outputBinaryStr, 2);
                    Console.WriteLine(ouputNum);
                }
                else
                {
                    Console.WriteLine(num);
                }
            }
        }
    }
}