SUM results from the data when product has arrived, until current moment

[#1]

Please help with getting right script.

working - sum({$<Дата={">01.01.2014<max(Дата)"}>}[Количество ед.])

don’t work - sum({$<Дата={">[дата последнего прихода]<max(Дата)"}>}[Количество ед.])

I need script above to get working.

Description of what this script have to calculate: I need to get SUM results from the data when product has arrived, until current moment.

Thank you!!!