abbv

class Integer
  def abbv
    return "#{self.div(10e2)}K" if self.between?(10e2, 10e5)
    return "#{self.div(10e5)}M" if self >= 10e5
    return "#{self}"
  end
end

[200, 3000, 5000, 800000, 60000, 7000000].each { |i|
  puts i.abbv
}