using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static long NN => long.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var odd = 1L;
        var tmp = n;
        while (tmp > 0)
        {
            if (tmp % 2 == 1) odd <<= 1;
            tmp >>= 1;
        }
        WriteLine(n + 1 - odd);
    }
}