How many people attended the game when Calgary was the home team and the decision was McLean?
CREATE TABLE "april" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "decision" text,
  "attendance" real,
  "record" text
);
SELECT COUNT("attendance") FROM "april" WHERE "decision"='mclean' AND "home"='calgary';