#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N,K; cin >> N >> K;
    vector<int> A(N),B(N),C(N);
    for(auto &a : A) cin >> a;
    for(auto &a : B) cin >> a;
    for(auto &a : C) cin >> a;

    long long answer = 0;
    for(auto &a : A) answer += a;
    for(auto &b : B) answer += b;
    vector<int> inc(N);
    for(int i=0; i<N; i++) inc.at(i) = C.at(i)-B.at(i);
    sort(inc.rbegin(),inc.rend());
    for(int i=0; i<N-K; i++) answer += inc.at(i);
    cout << answer << endl;
}