CREATE TABLE table_17458 ("Pick #" FLOAT, "Player" TEXT, "Position" TEXT, "Nationality" TEXT, "NHL team" TEXT, "College/junior/club team" TEXT)

How many nationalities are listed for the player Glen Irwin?
SELECT COUNT("Nationality") FROM table_17458 WHERE "Player" = 'Glen Irwin'
SELECT COUNT("Nationality") FROM "table_17458" WHERE "Player" = 'Glen Irwin'