Count the number of items in a warehouse

Hello,

I request to number the fig of items successful a warehouse. I already person the query to retrieve the items, but I'm not definite however to usage $count to execute the count

URL : 

https://<my sever>:50000/b1s/v1/$crossjoin(Items,Items/ItemWarehouseInfoCollection)?$expand=Items($select=ItemCode,ItemName)&$filter=Items/ItemCode eq Items/ItemWarehouseInfoCollection/ItemCode and Items/ItemWarehouseInfoCollection/WarehouseCode eq '1'

Thanks!.