n, k = map(int, input().split())
A = [*map(int, input().split())]
B = [*map(int, input().split())]
C = [*map(int, input().split())]

D = list()
idx_d = 0
for a, b in zip(A, B):
    D.append((a + b, 0, idx_d))
    idx_d += 1

idx_e = 0
E = list()
for a, c in zip(A, C):
    E.append((a + c, 1, idx_e))
    idx_e += 1

F = D + E
used = set()

ans = 0
F.sort(reverse=True)

made_salt = k
made_sauce = n - k
for i in range(len(F)):
    value = F[i][0]
    taste = F[i][1]
    index = F[i][2]
    if taste == 0 and made_salt > 0 and index not in used:
        ans += value
        made_salt -= 1
        used.add(index)
    if taste == 1 and made_sauce > 0 and index not in used:
        ans += value
        made_sauce -= 1
        used.add(index)

print(ans)