Database: superstore
Question: How many of the "Hon Pagoda Stacking Chairs" have been sold in total in the west superstore?
SQL: SELECT SUM(T1.Quantity) FROM west_superstore AS T1 INNER JOIN product AS T2 ON T1.`Product ID` = T2.`Product ID` WHERE T2.`Product Name` = 'Hon Pagoda Stacking Chairs'