N, K = map(int, input().split())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = list(map(int, input().split()))

SIO = [A[i] + B[i] for i in range(N)]
TARE = [A[i] + C[i] for i in range(N)]

print(f"{SIO=}")
print(f"{TARE=}")

diff_indices = sorted([(SIO[i] - TARE[i], i) for i in range(N)], reverse=True, key=lambda x: x[0])

print(f"{diff_indices=}")

# Cの合計値
total_sum = 0

# Aを選ぶべきK個を決定
for i in range(K):
    total_sum += SIO[diff_indices[i][1]]

# 残りのN-K個はBを選ぶ
for i in range(K, N):
    total_sum += TARE[diff_indices[i][1]]

print(total_sum)