What is the total number of high points on January 21?
CREATE TABLE "regular_season" (
  "game" real,
  "date" text,
  "team" text,
  "score" text,
  "high_points" text,
  "high_rebounds" text,
  "high_assists" text,
  "location_attendance" text,
  "record" text
);
SELECT COUNT("high_points") FROM "regular_season" WHERE "date"='January 21';