What is the maximum number in the series for the episode directed by Harvey S. Laidman?
CREATE TABLE "table1_228973_9" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text
);
SELECT MAX("no_in_series") FROM "table1_228973_9" WHERE "directed_by"='Harvey S. Laidman';