Problem 1 from Project Euler . net

Trying to reinforce the syntax in ruby, I did Problem 1 from Project Euler . net:

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.

x=0
1.upto(999) {

|i|
x=x+i if (i % 5 == 0 || i % 3 == 0)

}

print x

I’d like to do this by merging two sets of numbers next.