cnt = []
 
for i in range(26):
    cnt.append(int(input()))
 
ans = 1
for i in [3, 4, 7, 17, 22]:
    ans *= cnt[i]
 
o1 = cnt[14] // 2
o2 = cnt[14] - o1
ans *= o1 * o2
 
l = 0
for i in range(cnt[11]):
    l1 = cnt[11] - i
    l2 = i * (i - 1)
    l = max(l, l1 * l2 // 2)
ans *= l
 
print(ans)