class Calc0073
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @cs = args.map(&:first).map(&:to_i).map.with_index { |c, i|
      [(i + 'a'.ord).chr, c]
    }.to_h
  end

  def run
    rs = %w(h e w r d).map { |a| @cs[a] }
    rs += [calc_o, calc_l]
    rs.inject(:*)
  end

  def calc_o
    o = @cs['o']
    if o < 2
      0
    else
      (1..(o / 2)).map { |k| k * (o - k) }.max
    end
  end

  def calc_l
    c = @cs['l']
    if c < 3
      0
    else
      (2..(c - 1)).map { |k| (1..k).to_a.combination(2).size * (c - k) }.max
    end
  end
end

puts Calc0073.new(STDIN.readlines).run if __FILE__ == $0