using System;

namespace Probrem043
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = Console.ReadLine().Split(' ');
            var eat = int.Parse(input[0]);
            int bis = 1;

            for (int i = 0; i < eat; i++){
                if(bis == eat || (bis * 2) > eat) break;
                bis = bis * 2;
            }
                //var b = decimal.Parse(input[1]);
                //var ans = Math.Ceiling(b / a);

                Console.WriteLine(bis);
        }
    }
}