C = [int(input()) for _ in range(26)]
a = C[7]*C[4]*C[22]*C[17]*C[3]
b = 0
for i in range(2,C[11]-1):
    for j in range(1,C[14]):
        b = max(b,(i*(i-1))//2*(C[11]-i)*j*(C[14]-j))
print(a*b)