What is the highest grid for Aprilia vehicles, laps over 5, and a retirement finish?
CREATE TABLE "125cc_classification" (
  "rider" text,
  "manufacturer" text,
  "laps" real,
  "time" text,
  "grid" real
);
SELECT MAX("grid") FROM "125cc_classification" WHERE "manufacturer"='aprilia' AND "time"='retirement' AND "laps">5;