Among the payments made by Mary Smith, how many of them are over 4.99?
over 4.99 refers to amount > 4.99
SELECT COUNT(T1.amount) FROM payment AS T1 INNER JOIN customer AS T2 ON T1.customer_id = T2.customer_id WHERE T2.first_name = 'MARY' AND T2.last_name = 'SMITH' AND T1.amount > 4.99