h, e, l, o, w, r, d = 0, 0, 0, 0, 0, 0, 0
for i in range(26):
    s = chr(ord('a') + i)
    if s == 'h':
        h += int(input())
    elif s == 'e':
        e += int(input())
    elif s == 'l':
        l += int(input())
    elif s == 'o':
        o += int(input())
    elif s == 'w':
        w += int(input())
    elif s == 'r':
        r += int(input())
    elif s == 'd':
        d += int(input())
    else:
        input()
ans = h * e * w * r * d
ans *= ((o + 1) // 2) * (o // 2)
res = 0
for i in range(2, l):
    res = max(res, (i * (i - 1) // 2) * (l - i))
print(ans * res)