import sys
C = {}
h = "helloworld"
for i in range(27):
    tmp = input()
    if chr(i+97) in h:
        C[chr(i+97)] = int(tmp)

base = {}
for i in set(h):
    base[i] = h.count(i)

for i in base.keys():
    C[i] -= base[i]
    if C[i] < 0:
        print(0)
        sys.exit(0)

total = 1
for i in C.keys():
    if i != "l":
        total *= (C[i]+1)
    else:
        total *= max([total * ((j+1)*j//2) * (C[i]-j+2) for j in range(C[i]+1,0,-1)])
print(total)