import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();

        int maxN = 0;
        int maxI = 0;

        for (int i = 0; i <= N; i++) {

            int n = 0;
            int temp = i;
            while (temp % 2 == 0 && temp != 0) {
                temp = temp / 2;
                n++;
            }

            if (n >= maxN) {
                maxN = n;
                maxI = i;
            }
        }

        System.out.println(maxI);

    }


}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz