import itertools
L = list(map(int, input().split()))
rby = sorted(list(map(int,input().split())), reverse=True)
round = []
for x, y in itertools.combinations(L, 2):
    round.append((x+y)*2)
round.sort()
ans = 0
for i, j in zip(round, rby):
    ans += i * j
print(ans)