using System;
using System.Linq;
using System.Collections.Generic;

class No378
{
    static void Main()
    {
        var num = long.Parse(Console.ReadLine());
        var list = new List<long>();
        list.Add(num);
        while (num > 0)
        {
            num /= 2;
            list.Add(num);
        }
        var sum = list.Sum();
        long score = 0;
        var length = list.Count();
        for (int i = 0; i < length; ++i)
        {
            score += list[i];
            if (sum < score + list[i])
            {
                Console.WriteLine((score + list[i]) - sum);
                return;
            }
        }
    }
}