what's the minimum production code written by jay sommers & dick chevillat and al schwartz
CREATE TABLE "table1_12226390_3" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" real
);
SELECT MIN("production_code") FROM "table1_12226390_3" WHERE "written_by"='Jay Sommers & Dick Chevillat and Al Schwartz';