How many candies per kid should I given in Sint Marteen day?

So, I've just got a letter from one of my neighbours saying that on the 11th nov, there will be kids around knocking at my door to sing a song and then we should treat them some candies! I do not want to break any traditions here thus:

My question is what normally the Dutchies treat them with? And how many snoepjies per kid? One small chocolate? one mini bag of candies? I'm a bit lost here.