Translation:Excuse me, how much do five Karelian pasties cost?
The word "piirakka" also generally refers to something sweet and is commonly associated with pies, so I suppose it has been somewhat misleadingly named. Also, "karjalanpiirakka" actually translates to "Karelian pasty". Note that there is supposed to be just one R.
Yes it struck me after my post that pasty was the appropriate word in UK English at any rate, they are always savoury. I grew up with Devon pasties a regular part of my diet (I believe the Cornish may make something similar?) They are diced beef, potato, onion and swede (or turnip) wrapped in shortcrust pastry. I still use my Devonshire mother's recipe as improved by my Finnish wife! They are much bigger than the Karelian kind though, each enough for a full meal.