how many production codes were there for the episode that was 32 in the series?
CREATE TABLE "table1_17901155_3" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_u_s_air_date" text,
  "prod_code" text,
  "viewers_millions" text
);
SELECT COUNT("prod_code") FROM "table1_17901155_3" WHERE "no_in_series"=32;