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

using ll = long long;
#define rep(i, n) for(ll i = 0; i < n; i++)

int main() {
	int N, K;
	cin >> N >> K;
	vector<int> 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 = 0;
	vector<int> d(N);
	rep(i, N) {
		ans += a[i] + b[i];
		d[i] = c[i] - b[i];
	}
	sort(d.rbegin(), d.rend());
	rep(i, N - K) ans += d[i];
	cout << ans << endl;
}