What is the total number of attendees where the home team was Port Adelaide?
CREATE TABLE "round_1" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "ground" text,
  "crowd" text,
  "date" text,
  "time" text,
  "report" text
);
SELECT COUNT("crowd") FROM "round_1" WHERE "home_team"='Port Adelaide';