ns=[0]*26

for i in range(26):
    t=int(input())
    ns[i]=t

def  cal(x):
    t=1
    for i in range(x-1,0,-1):
        t=max(t,(i*(i-1)) // 2 * (x-i))
    return t
  
def  cal2(x):
    t=1
    for i in range(x-1,0,-1):
        t=max(t,i*(x-i))
    return t

s='helowrd'
ss='helloworld'
ans=1

for i in range(len(s)):
   
    if ns[ord(s[i])%97] < ss.count(s[i]):
        ans=0
        break
    else:
        if s[i] == 'l':
            t = cal(ns[ord(s[i])%97])
        elif s[i] == 'o':
            t = cal2(ns[ord(s[i])%97])
        else:
            t = ns[ord(s[i])%97]
            
        ans *= t
        
print(ans)