start = ord('a')
end = ord('z')
counts = dict()
for c in range(start, end + 1):
    n = int(input())
    counts[chr(c)] = n
h = counts['h']
e = counts['e']
l = counts['l']
o = counts['o']
w = counts['w']
r = counts['r']
d = counts['d']
if h < 1 or e < 1 or l < 3 or o < 2 or w < 1 or r < 1 or d < 1:
    print(0)
else:
    max_pattern = 0
    for i in range(2, l):
        pattern = i * (i - 1) * (l - i) // 2
        if pattern > max_pattern:
            max_pattern = pattern
    print(max_pattern * (o//2) * (o - o//2) * h * e * w * r * d)