xs={}
readlines.map(&:to_i).each.with_index {|n,i|
  xs[(97+i).chr] = n
}

ans = xs['h'] * xs['e'] * xs['w'] * xs['r'] * xs['d']

def c2(n)
  n*(n-1)/2
end

def o(n)
  (n/2) * (n - n/2)
end

def l(n)
  m = 0
  for k in 1..n
    m = [c2(n-k) * k, m].max
  end
  m
end

ans *= o(xs['o'])
ans *= l(xs['l'])

p ans