# Problem 1
# If we list all the natural numbers below 10 that are multiples of 3
# or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
# Find the sum of all the multiples of 3 or 5 below 1000.

0 upto: 999 .
  select: |x| { x % 3 == 0 or: (x % 5 == 0) } .
  sum println