def c2(n):
    return n * (n - 1) // 2

C = [int(input()) for i in range(26)]
ans = 1

ans *= C[ord('h') - ord('a')]
ans *= C[ord('e') - ord('a')]
ans *= C[ord('w') - ord('a')]
ans *= C[ord('r') - ord('a')]
ans *= C[ord('d') - ord('a')]

n = C[ord('l') - ord('a')]

m1 = 0

for x in range(1, n):
    tmp = c2(x) * (n - x)
    m1 = max(m1, tmp)

ans *= m1

n = C[ord('o') - ord('a')]
m1 = 0

for x in range(1, n):
    tmp = x * (n - x)
    m1 = max(tmp, m1)

ans *= m1

print(ans)