When 3 is the number what is the highest total?
CREATE TABLE "table1_24781886_3" (
  "total" real,
  "num" real,
  "title" text,
  "director" text,
  "writer_s" text,
  "viewers" text,
  "air_date" text,
  "production_code" real
);
SELECT MAX("total") FROM "table1_24781886_3" WHERE "num"=3;