CREATE TABLE table_28803803_1 (irst VARCHAR, original_channel VARCHAR)

How many IRST figures for the show that premiered on Canale 5 (2006)?
SELECT COUNT(irst) FROM table_28803803_1 WHERE original_channel = "Canale 5 (2006)"
SELECT COUNT("irst") FROM "table_28803803_1" WHERE "Canale 5 (2006)" = "original_channel"