What was the highest lap for Luigi Piotti with more than 13 grid and a time/retired engine?
CREATE TABLE "classification" (
  "driver" text,
  "constructor" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT MAX("laps") FROM "classification" WHERE "grid">13 AND "time_retired"='engine' AND "driver"='luigi piotti';