Of the 4 root beers that Frank-Paul Santangelo purchased on 2014/7/7, how many of them were in cans?
on 2014/7/7 refers to transactiondate = '2014-07-07'; in cans refers to containertype = 'Can';
SELECT COUNT(T1.CustomerID) FROM customers AS T1 INNER JOIN `transaction` AS T2 ON T1.CustomerID = T2.CustomerID INNER JOIN rootbeer AS T3 ON T2.RootBeerID = T3.RootBeerID WHERE T1.First = 'Frank-Paul' AND T1.Last = 'Santangelo' AND T2.TransactionDate = '2014-07-07' AND T3.ContainerType = 'Can'