alphas = []
necessary_alpha_idx = [3, 4, 7, 11, 14, 17, 22]
necesarry_alpha_cnt = [1, 1, 1, 3, 2, 1, 1]
alpha_cnt = []

def check():
    for i in range(7):
        target = necessary_alpha_idx[i]
        if alphas[target] < necesarry_alpha_cnt[i]:
            return False
        else:
            alpha_cnt.append(alphas[target])
    return True


for i in range(26):
    alphas.append(int(input()))

if check():
    l_cnt = alpha_cnt[3]
    o_cnt = alpha_cnt[4]

    l_max = 0
    for x in range(1,l_cnt-1):
        res = (l_cnt - x) * (l_cnt - x - 1) // 2 * x
        l_max = max(res, l_max)
    alpha_cnt[3] = l_max

    o_max = (o_cnt >> 1) * (o_cnt - (o_cnt >> 1))
    alpha_cnt[4] = o_max

res = alpha_cnt[0]
for i in range(1, 7):
    res *= alpha_cnt[i]

print(res)