How many orders were shipped to GREAL via United Package?
GREAL refers to CustomerID = 'GREAL'; via United Package refers to CompanyName = 'United Package'
SELECT COUNT(T1.OrderID) FROM Orders AS T1 INNER JOIN Shippers AS T2 ON T1.ShipVia = T2.ShipperID WHERE T1.CustomerID = 'GREAL' AND T2.CompanyName = 'United Package'