import java.io.*;
import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int x = sc.nextInt();
		
		int test = 1;
		int currentHighestDivisible = 0;
		int currentWinner = 1;
		
		while (test <= x) {
			int testDividedByTwo = test;
			int testFactorsOfTwo = 0;
			while (testDividedByTwo % 2 == 0) {
				testFactorsOfTwo += 1;
				testDividedByTwo = testDividedByTwo/2;
			}
			if (testFactorsOfTwo > currentHighestDivisible) {
				currentWinner = test;
				currentHighestDivisible = testFactorsOfTwo;
				test += 1;
			} else {
				test += 1;
			}
		}
		System.out.println(currentWinner);
	}
}

/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