
import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		if(n%2==1)n-=1;
		int max = 0,a, count,ans=1;
		for(int i = 2;i <= n;i+=2) {
			count = 0;
			a = i;
			for(;;) {
				if(a / 2 != 0) {
					a = a/2;
					count++;
				}
				else {
					count++;
					break;
				}
			}
			if(max < count) {
				max = count;
				ans = i;
			}
		}
		System.out.println(ans);
	}

}

/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