/* package codechef; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
public class Main
{
    public static long find(long n,HashMap<Long,Long>hm)
    {if(hm.containsKey(n))
    return hm.get(n);
    else 
    {hm.put(n,1+2*find(n/2,hm));
    return hm.get(n);}
    }
	public static void main (String[] args) throws java.lang.Exception
	{
	    Scanner s=new Scanner(System.in);
	    long h=s.nextLong();
	    HashMap<Long,Long>hm=new HashMap<>();
	    Long p=new Long(1);
	    Long q=new Long(1);
	    hm.put(p,q);
	    long ans=find(h,hm);
	    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