D = {chr(97 + i): int(input()) for i in range(26)}

nC2 = lambda n: n * (n - 1) // 2

h = D['h']
e = D['e']
l = max(nC2(i) * (D['l'] - i) for i in range(2, D['l']))
o = max(i * (D['o'] - i) for i in range(1, D['o']))
w = D['w']
r = D['r']
d = D['d']
print(h * e * l * o * w * r * d)