What is the sum of the episodes where chip esten was the 4th performer and jim meskimen was the 1st performer?
CREATE TABLE "series_4" (
  "date" text,
  "episode" real,
  "performer_1" text,
  "performer_2" text,
  "performer_3" text,
  "performer_4" text
);
SELECT SUM("episode") FROM "series_4" WHERE "performer_4"='chip esten' AND "performer_1"='jim meskimen';