CREATE TABLE table_24535 ("No. in total" TEXT, "No. in series" TEXT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT)

How many number in series's are written by Greg Haddrick?
SELECT COUNT("No. in series") FROM table_24535 WHERE "Written by" = 'Greg Haddrick'
SELECT COUNT("No. in series") FROM "table_24535" WHERE "Written by" = 'Greg Haddrick'