What is the Official # that has a French title of "Pierre de Lune"?
CREATE TABLE "season_3" (
  "official_num" real,
  "tf1_num" real,
  "french_title" text,
  "english_title" text,
  "air_date_france" text,
  "original_beechwood_bunny_tale_source_material" text
);
SELECT "official_num" FROM "season_3" WHERE "french_title"='\"pierre de lune\"';