#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(void) {
    int n,k;
    cin >> n >> k;

    vector<ll> a(n);
    vector<ll> b(n);
    vector<ll> c(n);
    for (int i = 0; i < n; i++) cin >> a[i];
    for (int i = 0; i < n; i++) cin >> b[i];
    for (int i = 0; i < n; i++) cin >> c[i];

    // aは総和で良い
    // bとcはどちらを選ぶか
    // 差が大事

    ll ans = accumulate(a.begin(),a.end(),0ll) + accumulate(c.begin(),c.end(),0ll);

    vector<ll> d(n);
    for (int i = 0; i < n; i++) d[i] = b[i]-c[i];
    sort(d.rbegin(),d.rend());
    for (int i = 0; i < k; i++) {
        ans += d[i];
    }

    cout << ans << endl;

    
    return 0;
}