What is total number of laps for bikes manufactured by KTM with a time of +3.578 and a grid number larger than 4?
CREATE TABLE "250cc_classification" (
  "rider" text,
  "manufacturer" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT COUNT("laps") FROM "250cc_classification" WHERE "manufacturer"='ktm' AND "time_retired"='+3.578' AND "grid">4;