How many points were there in a year earlier than 1977, a Cosworth V8 engine, and an entry from HB Bewaking alarm systems?
CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);
SELECT "points" FROM "complete_formula_one_world_championship_" WHERE "year"<1977 AND "engine"='cosworth v8' AND "entrant"='hb bewaking alarm systems';