CREATE TABLE table_22312 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Canadian air date" TEXT, "U.S. air date" TEXT, "Production code" FLOAT, "Canadian viewers  ( million ) " TEXT)

What is the total number of episodes listed with a production code of 306?
SELECT COUNT("#") FROM table_22312 WHERE "Production code" = '306'
SELECT COUNT("#") FROM "table_22312" WHERE "Production code" = '306'