# L1 < L2 < L3
# R * 2 * (L1 + L2)
# B * 2 * (L1 + L3)
# Y * 2 * (L2 + L3)
# R > B > Y
ls = sorted(map(int, raw_input().split()))
cs = sorted(map(int, raw_input().split()), reverse=True)
ans = cs[0] * 2 * (ls[0] + ls[1]) + cs[1] * 2 * (ls[0] + ls[2]) + cs[2] * 2 * (ls[1] + ls[2])
print(ans)