#include <bits/stdc++.h>
using namespace std;
#define all(v) (v).begin(),(v).end()
#define pb(a) push_back(a)
#define rep(i, n) for(int i=0;i<n;i++)
#define foa(e, v) for(auto& e : v)
using ll = long long;
const ll MOD7 = 1000000007, MOD998 = 998244353, INF = (1LL << 60);
#define dout(a) cout<<fixed<<setprecision(10)<<a<<endl;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll n, k;
    cin >> n >> k;
    ll sum = 0;
    vector<ll> v;
    vector<ll> b(n);
    rep(i, n) {
        ll a; cin >> a;
        sum += a;
    }
    rep(i, n) {
        cin >> b[i];
        sum += b[i];
    }
    rep(i, n) {
        ll a; cin >> a;
        v.push_back(a - b[i]);
    }
    sort(all(v));
    reverse(all(v));
    k = n - k;
    rep(i, k) sum += v[i];
    cout << sum << endl;
    return 0;
}