How many times was team 1 the wykeham wonderers?
CREATE TABLE "table1_18733480_1" (
  "episode_num" real,
  "air_date" text,
  "team_1" text,
  "players_left_after_round_1" text,
  "team_2" text
);
SELECT COUNT("players_left_after_round_1") FROM "table1_18733480_1" WHERE "team_1"='Wykeham Wonderers';