CREATE TABLE table_25667 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Prod. code" TEXT, "Viewers  ( millions ) " TEXT)

For the episode directed by Matthew Penn, what is the total number in the series?
SELECT "No. in series" FROM table_25667 WHERE "Directed by" = 'Matthew Penn'
SELECT "No. in series" FROM "table_25667" WHERE "Directed by" = 'Matthew Penn'