What is the lap total for george eaton, with a grid under 17 retiring due to gearbox?
CREATE TABLE "classification" (
  "driver" text,
  "constructor" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT SUM("laps") FROM "classification" WHERE "time_retired"='gearbox' AND "driver"='george eaton' AND "grid"<17;