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

class InvertingBits
{
    static void Main(string[] args)
    {
        int n = 10;
        int pow = (int)Math.Log(n, 2)+1;
        //Console.WriteLine(pow);
        int assist = (int)Math.Pow(2, pow) - 1;
        int result = n ^ assist;
        Console.WriteLine(result);
    }
}