Zero
EDIT: I'm not even sure of the rules any more, I bought a set not long ago and the 'rules' were basically 'match the spots... keep going until someone can't play'. I'm sure you have to bugger about with mates, adding the first and last numbers together in the line (say 3 at one end and 6 at the other = 9) and then you score points for how many 3s and 5s you can divide the sum of these numbers by. So in my example 3/5 = 3 points (3*3=9 / not divisible by 5 into an integer).
Am I wrong on this? I think I might be :S