Project Euler . Problem 5 . Smallest multiple : 2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?

projecteuler5.rb

$MAXNUM = 20
$target = [$MAXNUM]
$x = $MAXNUM
p 'Target : ' + $x.to_s
while $x >= 2
  if $MAXNUM % $x != 0 then
    $target.push($x)
    p 'Target : ' + $x.to_s
  end
  $x -= 1
end

$answer = $MAXNUM
loop do
  flag = true
  $x = 0
  while $x<$target.length
    if $answer % $target[$x] != 0 then
      flag = false
      break
    end
    $x += 1
  end
  break if flag
  $answer += $MAXNUM
end
p $answer