using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        var n = long.Parse(Console.ReadLine().Trim());
        var p = 0;
        for (int i = 0; i <= 60; i++)
        {
            if (((n >> i) & 1) == 1) p = Max(p, i);
        }
        Console.WriteLine(1L << p);
    }
}