CREATE TABLE "table1_14346689_1" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "story_by" text,
  "teleplay_by" text,
  "directed_by" text,
  "original_air_date" text
);

Question: What was the series number of the episode directed by Rob Bailey?
SQL: SELECT MAX("series_num") FROM "table1_14346689_1" WHERE "directed_by"='Rob Bailey';