L = list(map(int, input().split()))
ShuL = [2 * (sum(L) - L[i]) for i in range(3)]
ShuN = list(map(int, input().split()))
ShuL.sort()
ShuN.sort(reverse = True)
ans = 0
for i in range(3):
    ans += ShuL[i] * ShuN[i]
print(ans)