When driver heinz-harald frentzen has a number of laps greater than 60, what is the sum of grid?
CREATE TABLE "race" (
  "driver" text,
  "constructor" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT COUNT("grid") FROM "race" WHERE "laps">60 AND "driver"='heinz-harald frentzen';