For the order from "HILAA" on 1997/12/25, what was the total quantity of the products in that order?
HILLA refers to CustomerID = 'HILAA'; on 1997/12/25 refers to OrderDate = '1997/12/25';
SELECT SUM(T2.Quantity) FROM Orders AS T1 INNER JOIN `Order Details` AS T2 ON T1.OrderID = T2.OrderID WHERE T1.CustomerID = 'HILAA' AND T1.OrderDate LIKE '1997-12-25%'