Among the customers having at least one shipment in 2017, how many of them have an annual revenue of over 30000000?
shipment in 2017 refers to Cast(ship_date AS DATE) = 2017; annual revenue of over 30000000 refers to annual_revenue > 30000000
SELECT COUNT(COUNTCUSID) FROM ( SELECT COUNT(T1.cust_id) AS COUNTCUSID FROM customer AS T1 INNER JOIN shipment AS T2 ON T1.cust_id = T2.cust_id WHERE STRFTIME('%Y', T2.ship_date) = '2017' AND T1.annual_revenue > 30000000 GROUP BY T1.cust_id HAVING COUNT(T2.ship_id) >= 1 ) T3