What is the highest episode number?
CREATE TABLE "table1_23294081_11" (
  "no" real,
  "num" real,
  "original_airdate" text,
  "performer_1" text,
  "performer_2" text,
  "performer_3" text,
  "performer_4" text,
  "u_s_viewers_millions" text
);
SELECT MAX("no") FROM "table1_23294081_11";