How many total number have robert young as the director?
CREATE TABLE "films_in_series" (
  "num" real,
  "title" text,
  "maneater" text,
  "television_premiere" text,
  "dvd_release" text,
  "writer" text,
  "director" text,
  "producer" text
);
SELECT COUNT("num") FROM "films_in_series" WHERE "director"='Robert Young';