Problem 9 on Project Euler

p9.rb

class Numeric
  def squared
    self * self
  end
end

(1..1000/3).each do |a| 
  (a+1..1002-2*a).each do |b|
    c = 1000 - a - b
    if a + b > c && a.squared + b.squared == c.squared
      puts a * b * c
      exit
    end
  end
end