What is the sum of season when the venue was donington park, and Brazil came in second?
CREATE TABLE "champions" (
  "season" real,
  "venue" text,
  "teams" real,
  "drivers" real,
  "champion" text,
  "second" text,
  "third" text
);
SELECT SUM("season") FROM "champions" WHERE "venue"='donington park' AND "second"='brazil';