n, k = map(int, input().split())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
c = list(map(int, input().split()))
ls = sorted([[b[i] - c[i], b[i], c[i]] for i in range(n)])
ans = sum(a) + sum(b) + sum(c)
for i in range(n):
  if i < n - k:
    ans -= ls[i][1]
  else:
    ans -= ls[i][2]
print(ans)