C = [int(input()) for _ in range(26)]
alpha = 'abcdefghijklmnopqrstuvwxyz'
idx = {}
c = 0

for alpha_i in alpha:
    idx[alpha_i] = c
    c += 1

h = C[idx['h']]
e = C[idx['e']]
l = C[idx['l']]
o = C[idx['o']]
w = C[idx['w']]
r = C[idx['r']]
d = C[idx['d']]
ans = h*e*(o//2)*(o-o//2)*w*r*d
l_max = 0

for i in range(l+1):
    l_max = max(l_max, i*(i-1)//2*(l-i))

ans *= l_max

print(ans)