Name the least series number written by brenda hampton and directed by  burt brinckerhoff
CREATE TABLE "table1_26261072_1" (
  "series_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text
);
SELECT MIN("series_num") FROM "table1_26261072_1" WHERE "written_by"='Brenda Hampton' AND "directed_by"='Burt Brinckerhoff';