#include <bits/stdc++.h>
#ifdef DEBUG
#include "cpp-dump/dump.hpp"
#define dump(...) cpp_dump(__VA_ARGS__)
#else
#define dump(...)
#endif
using namespace std;
typedef long long ll;

void solve() {
    ll n,k;
    cin >> n >> k;
    vector<ll> A(n), B(n), C(n);
    for (ll i = 0; i < n; ++i) cin >> A[i];
    for (ll i = 0; i < n; ++i) cin >> B[i];
    for (ll i = 0; i < n; ++i) cin >> C[i];

    vector<pair<ll, pair<ll, ll>>> diff(n);
    for (ll i = 0; i < n; ++i) {
        diff[i].first = B[i] - C[i];
        diff[i].second.first = B[i];
        diff[i].second.second = C[i];
    }

    sort(diff.rbegin(), diff.rend());
    dump(diff);
    
    ll ans = accumulate(A.begin(), A.end(), 0ll);
    for (ll i = 0; i < n; ++i) {
        if (i < k) ans += diff[i].second.first;
        else ans += diff[i].second.second;
    }


    cout << ans << endl;
}

int main() {
    solve();
    return 0;
}