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.

#!/usr/bin/ruby
i = 0
total = 0
for i in 0...1000 
	if (i % 3 == 0 || i % 5 == 0)
		total += i
	end
end
puts 'Total: ' + total.to_s