def solve():
    L = list(map(int, input().split()))
    R, B, Y = list(map(int, input().split()))

    x = (L[0] + L[1]) * 2
    y = (L[0] + L[2]) * 2
    z = (L[1] + L[2]) * 2

    l = [x, y, z]
    l.sort()

    r = [R, B, Y]
    r.sort(reverse=True)

    print(sum(a * b for a, b in zip(l, r)))


if __name__ == '__main__':
    solve()