What is the highest flap for class 500 cc?
CREATE TABLE "by_class" (
  "class" text,
  "seas" text,
  "1st_gp" text,
  "1st_pod" text,
  "1st_win" text,
  "race" real,
  "podiums" real,
  "pole" real,
  "f_lap" real,
  "w_chmp" real
);
SELECT MAX("f_lap") FROM "by_class" WHERE "class"='500 cc';