Name the most series number for giula sandler
CREATE TABLE "table1_15838081_3" (
  "season_num" real,
  "series_num" real,
  "title" text,
  "director_s" text,
  "writer_s" text,
  "original_airdate" text
);
SELECT MAX("series_num") FROM "table1_15838081_3" WHERE "writer_s"='Giula Sandler';