#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int n, k;
  cin >> n >> k;
  vector<ll> a(n), b(n), c(n);
  rep(i, n) cin >> a[i];
  rep(i, n) cin >> b[i];
  rep(i, n) cin >> c[i];
  ll ans = accumulate(a.begin(), a.end(), 0LL) + accumulate(b.begin(), b.end(), 0LL);
  rep(i, n) c[i] = c[i] - b[i];
  sort(c.rbegin(), c.rend());
  rep(i, n - k) ans += c[i];
  cout << ans << endl;
  return 0;
}