import java.util.List;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Comparator;
import java.io.BufferedReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.util.Collections;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 * @author Praveen
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TADELIVE solver = new TADELIVE();
		solver.solve(1, in, out);
		out.close();
	}
}

class TADELIVE {
    class Point {
        int a, b, diff;

        Point(int a, int b) {
            this.a = a;
            this.b = b;
            this.diff = Math.abs(a - b);
        }
    }

    public void solve(int testNumber, InputReader in, PrintWriter out) {
        int n = in.nextInt();
        int x = in.nextInt();
        int y = in.nextInt();
        int sum = 0;
        int a[] = new int[n];
        int b[] = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = in.nextInt();
        }
        for (int i = 0; i < n; i++) {
            b[i] = in.nextInt();
        }
        List<Point> orders = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            orders.add(new Point(a[i], b[i]));
        }
        Collections.sort(orders, new Comparator<Point>() {
            @Override
            public int compare(Point o1, Point o2) {
                if (o1.diff < o2.diff) {
                    return -1;
                } else if (o1.diff > o2.diff) {
                    return 1;
                } else {
                    return 0;
                }
            }
        });  
        Collections.reverse(orders);
        int ans = 0;
        for (int i = 0; i < n; i++) {
            Point p = orders.get(i);
            if (p.a > p.b) {
                if (x > 0) {
                    x --;
                    ans += p.a;
                } else {
                    y --;
                    ans += p.b;
                }
            } else {
                if (y > 0) {
                    y --;
                    ans += p.b;
                } else {
                    x --;
                    ans += p.a;
                }
            }
        }
        out.println(ans);
    }
}

class InputReader {
    public BufferedReader reader;
    public StringTokenizer tokenizer;

    public InputReader(InputStream stream) {
        reader = new BufferedReader(new InputStreamReader(stream), 32768);
        tokenizer = null;
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }

    public int nextInt() {
        return Integer.parseInt(next());
    }

}