TriBitSwitch

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TriBitSwitch
    {
    class TriBitSwitch
        {
        static void Main()
            {
            long number = long.Parse(Console.ReadLine());
            int pos = int.Parse(Console.ReadLine());
            long bitExchange;
            for (int i = pos; i <= pos + 2; i++)
                {
                bitExchange = number ^ (1 << i);
                number = bitExchange;
                }
            Console.WriteLine(number);
            }
        }
    }