ll = list(map(int, raw_input().split()))
rr = list(map(int, raw_input().split()))

rr.sort(reverse=True)

x = ll[0]*2 + ll[1]*2
y = ll[1]*2 + ll[2]*2
z = ll[2]*2 + ll[0]*2

mm = sorted([x,y,z])

result = 0
for i in range(3):
    result += rr[i] * mm[i]

print(result)