How many Giro positions are associated with the year 1971 and Tour final positions over 50?
CREATE TABLE "grand_tour_finishers" (
  "rider" text,
  "year" real,
  "final_position_giro" real,
  "final_position_tour" real,
  "final_position_vuelta" real
);
SELECT COUNT("final_position_giro") FROM "grand_tour_finishers" WHERE "year"=1971 AND "final_position_tour">50;