import sys, time, random
from collections import deque, Counter, defaultdict
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353

na, nb, nc = mi()

a = sorted(li(), reverse=True)
b = sorted(li(), reverse=True)
c = sorted(li(), reverse=True)
A = []
for v in a:
    A.append((v, 'a'))

for v in b:
    A.append((v, 'b'))
for v in c:
    A.append((v, 'c'))

ans = -inf
A.sort(key=lambda x: x[0], reverse=True)
sa = 0
sb = 0
sc = 0
aa = 0
bb = 0
cc = 0
for v, c in A:
    if c == 'a':
        if v * bb + sc >= 0:
            sa += v
            aa += 1
    elif c == 'b':
        if v * cc + sa >= 0:
            sb += v
            bb += 1
    else:
        if v * aa + sb >= 0:
            sc += v
            cc += 1
    ans = max(ans, sa * bb + sb * cc + sc * aa)
print(ans)