D = [0] * 26
for i in range(26):
    D[i] = int(input())
    
ans = 1
L = D[ord("l") - ord("a")]
O = D[ord("o") - ord("a")]
vL = -1
vO = -1
for i in range(L + 1):
    vL = max(vL, i * (i - 1)//2 * (L - i))
for i in range(O + 1):
    vO = max(vO, i * (O - i))
ans = vL * vO
for s in ["h", "e", "w", "r", "d"]:
    ans *= D[ord(s) - ord("a")]
print(ans)