How many production stage managers worked with Gabriel di Chiara as the Male Rep?
CREATE TABLE "past_board_members" (
  "year" text,
  "chairman" text,
  "artistic_director" text,
  "performance_liaison" text,
  "secretary" text,
  "business_manager" text,
  "production_stagemanager" text,
  "dramaturge" text,
  "public_relations" text,
  "first_second_year_rep" text,
  "male_rep" text
);
SELECT COUNT("production_stagemanager") FROM "past_board_members" WHERE "male_rep"='Gabriel Di Chiara';