#!/usr/bin/env pugs

=begin Problem
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.
=cut

use v6;
use Benchmark;

sub main {
    my @multiples = grep { $^a % 3 == 0 || $^a % 5 == 0 }, 1..^1000;
    say sum(@multiples);
}

my @t = timeit(1, \&main);
say "execution time: @t[0]"