Let me see if I get this right: you cannot get seats unless your list gets 4% nationwide or 12% in a single district, but then you have a top-up PR system, so 4% of the vote should translate into 4% of the seats. There are 349 seats, so if Piratpartiet makes it they will have at least 13 seats.

Nothing is 'mere'. — Richard P. Feynman