
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        
        int ans = 1;
        for (int i = n; 0 < i; i--) {
        	int cnt = 0;
        	for (int j = 2;; j *= 2) {
        		if (i % j == 0) {
        			cnt = j;
        		} else {
        			break;
        		}
        	}
        	ans = Math.max(ans, cnt);
		}
        
        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