import strutils, tables

const N = 26

proc nCr(n, r: int): int =
  var (n, r) = (n, r)
  if r == 0 or n == r: return 1
  if r > n-r: r = n-r
  var res = 1
  for x in n-r+1 .. n: res *= x
  for x in 1 .. r: res = res div x
  return res

var
  c = newSeq[int](N)
  res = 1
  dic = initTable[char, int]()

for ch in "helloworld":
  dic[ch] = ord(ch) - ord('a')

for i in 0.. <N:
  c[i] = stdin.readLine.parseInt

for ch, pos in dic:
  var
    n = c[pos]
    x: int
  if ch == 'l':
    if n <= 2: x = 0
    else:
      for a in 2.. <n:
        x = max(x, nCr(a, 2)*(n-a))
  elif ch == 'o':
    if n <= 1: x = 0
    else:
      for a in 1.. <n:
        x = max(x, a * (n-a))
  else:
    x = n
  res *= x

echo res