import sys
C = {}
h = "helloworld"
for i in range(26):
    tmp = input()
    if chr(i+97) in set(h):
        C[chr(i+97)] = int(tmp)

total = C["h"]
for i in set(h)-set("h"):
    if i != "l" and i != "o":
        total *= C[i]
    elif i == "o":
        total *= C[i]//2
        total *= C[i]-C[i]//2
    else:
        total *= max([(j*(j-1)//2) * (C[i]-j) for j in range(C[i],0,-1)])
print(total)