import java.util.*;
public class Main { 
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        long o=0;
        long h=sc.nextLong();
        long c=1;
        while(h>=1){
            o+=c;
            c*=2;
            h/=2;
        }
       //PriorityQueue<Long> pq = new PriorityQueue<>(Collections.reverseOrder());
      
      
      System.out.println(o);
    }
}
/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