How many elite users have reviewed Yelp_Business no.1?
Yelp_Business no.1 refers to business_id = 1
SELECT COUNT(T1.user_id) FROM Users AS T1 INNER JOIN Elite AS T2 ON T1.user_id = T2.user_id INNER JOIN Reviews AS T3 ON T1.user_id = T3.user_id WHERE T3.business_id = 1