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