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

class MyClass
{
    public static long dist(long x, int num)
    {
        var ret = 0L;
        for (int i = 0; i < num; i++)
        {
            ret += x >> i;
        }
        return ret;
    }

    public static void Solve()
    {
        var d = long.Parse(Console.ReadLine());
        var set = new HashSet<long>();
        for (int num = 1; num <= 64; num++)
        {
            var l = d / 2;
            var r = d + 1;
            while (r - l > 1)
            {
                var mid = (l + r) / 2;
                var v = dist(mid, num);
                if (v <= d)
                {
                    l = mid;
                }
                else
                {
                    r = mid;
                }
            }
            if (dist(l, num) == d)
            {
                set.Add(l);
            }
        }
        Console.WriteLine(set.Min());
    }

    public static void Main()
    {
        var sw = new System.IO.StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
        Console.SetOut(sw);
        Solve();
        Console.Out.Flush();
    }
}