# Ethiopian Multiplication
  # usage: ruby em.rb 673 7
  m, n = ARGV.map(&:to_i)
  product = 0
  while m >= 1
    puts "%4d : %4d %s" % [m, n, m.even? ? "Ignore" : ""]
    product += n unless m.even?
    m = m / 2
    n = n * 2
  end
  puts "Product: #{product}"