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


	public class Main {
		public static void main(String[] args) {
			int number=0;
			int counter=0;
			int previousCounter=0;
			int number1=1;
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		for( int i=0; i<= x; i++)
		{
			number=i;
			while(number%2==0 && number!=0) 
			{
				number= number/2;
				counter++;
			}
			if(counter>previousCounter)
			{
				previousCounter=counter;
				number1=i;
			}
			counter=0;
			
		}
		System.out.print(number1);
		sc.close();
		}
}
/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