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

class Program
{
    static long NN => long.Parse(ReadLine());
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var d = NN;
        var ans = long.MaxValue;
        for (var i = 0; i < 61; ++i)
        {
            var ok = 1L << i;
            var ng = d * 2 + 1;
            while (ng - ok > 1)
            {
                var mid = (ok + ng) / 2;
                var tmp = mid;
                var sum = tmp;
                for (var j = 0; j < i; ++j)
                {
                    tmp >>= 1;
                    sum += tmp;
                }
                if (sum > d) ng = mid;
                else ok = mid;
            }
            {
                var tmp = ok;
                var sum = tmp;
                for (var j = 0; j < i; ++j)
                {
                    tmp >>= 1;
                    sum += tmp;
                }
                if (d == sum) ans = Math.Min(ans, ok);
            }
        }
        WriteLine(ans);
    }
}