import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long H = sc.nextLong();
    long answer =0;
    long enmcnt =1;
    while(H!=1){
      answer = answer + enmcnt;
      H=H/2;
      enmcnt=enmcnt*2;
      //System.out.println(answer);
    }
    answer = answer + enmcnt;
    System.out.println(answer);
    
    
    
  }
  

  
}
/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