class Calc0047
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @n = args.shift.first.to_i
  end

  def run
    k = @n.bit_length - 1
    if @n == 1 << k
      k
    else
      k + 1
    end
  end
end

puts Calc0047.new(STDIN.readlines).run if __FILE__ == $0