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.

**Answer**

**Script**

Execution Time: 0.0004 seconds

$maxVal = 1000; $startVal = 3; $sum = 0; for ($x=$startVal; $x<$maxVal; $x++) { if($x%3==0 || $x%5==0) { $sum += $x; } } echo $sum.PHP_EOL;