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

class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long h = sc.nextLong();
    long attacks = 0;
    long temp =1;
    while(h>0){
      attacks+=temp;
      temp*=2;
      h/=2;
    }
    System.out.println(attacks);
  }
}
      
      

/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