What is the production number directed by Robert McKimson in series mm titled People Are Bunny?
CREATE TABLE "1959" (
  "title" text,
  "series" text,
  "director" text,
  "production_number" real,
  "release_date" text
);
SELECT SUM("production_number") FROM "1959" WHERE "director"='robert mckimson' AND "series"='mm' AND "title"='people are bunny';