#include <bits/stdc++.h>
#define rep(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
using namespace std;

typedef long long ll;

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