# Description: Find the sum of the first N natural numbers using Python. # We can only sum the first natural numbers if n is greater than or equal to 1, # we can't sum "the first -1 natural numbers".

# 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.