import java.util.*;import java.io.*;import java.math.*;
public class Main
{
    static class Node{
        long x;
        char y;
        Node(long x, char y){
            this.x=x;
            this.y=y;
        }
    }

    public static class CustomSort implements Comparator<Node>{
        public int compare(Node a,Node b){
                return -(int)(a.x-b.x);
        }
    }
    public static void process()throws IOException
    {
        int x=ni();
        int y=ni();
        int a=ni();
        int b=ni();
        int c=ni();
        ArrayList<Node> list = new ArrayList<>();
        for(int i=0;i<a;i++)
            list.add(new Node(nl(),'R'));
        for(int i=0;i<b;i++)
            list.add(new Node(nl(),'G'));
        for(int i=0;i<c;i++)
            list.add(new Node(nl(),'C'));
        Node[]A=new Node[list.size()];
        A=list.toArray(A);
        Arrays.sort(A,new CustomSort());
        int red=0,green=0,total=0;
        long ans=0;
        for(int i=0;i<A.length;i++)
        {
            if(total==x+y)
                break;
            if(A[i].y=='R' && red<x)
            {
                ans+=A[i].x;
                total++;
                red++;
            }
            if(A[i].y=='G' && green<y)
            {
                ans+=A[i].x;
                total++;
                green++;
            }
            if(A[i].y=='C')
            {
                ans+=A[i].x;
                total++;
            }
        }
        pn(ans);
    }

    static AnotherReader sc;
    static PrintWriter out;
    public static void main(String[]args)throws IOException
    {
        boolean oj = true;
        if(oj){sc=new AnotherReader();out=new PrintWriter(System.out);}
        else{sc=new AnotherReader(100);out=new PrintWriter("output.txt");}
        int t=1;
        // t=ni();
        while(t-->0) {process();}
        out.flush();out.close();  
    }

    static void pn(Object o){out.println(o);}
    static void p(Object o){out.print(o);}
    static void pni(Object o){out.println(o);out.flush();}
    static int ni()throws IOException{return sc.nextInt();}
    static long nl()throws IOException{return sc.nextLong();}
    static double nd()throws IOException{return sc.nextDouble();}
    static String nln()throws IOException{return sc.nextLine();}
    static int[] nai(int N)throws IOException{int[]A=new int[N];for(int i=0;i!=N;i++){A[i]=ni();}return A;}
    static long[] nal(int N)throws IOException{long[]A=new long[N];for(int i=0;i!=N;i++){A[i]=nl();}return A;}
    static long gcd(long a, long b)throws IOException{return (b==0)?a:gcd(b,a%b);}
    static int gcd(int a, int b)throws IOException{return (b==0)?a:gcd(b,a%b);}
    static int bit(long n)throws IOException{return (n==0)?0:(1+bit(n&(n-1)));}

/////////////////////////////////////////////////////////////////////////////////////////////////////////

    static class AnotherReader{BufferedReader br; StringTokenizer st;
    AnotherReader()throws FileNotFoundException{
    br=new BufferedReader(new InputStreamReader(System.in));}
    AnotherReader(int a)throws FileNotFoundException{
    br = new BufferedReader(new FileReader("input.txt"));}
    String next()throws IOException{
    while (st == null || !st.hasMoreElements()) {try{
    st = new StringTokenizer(br.readLine());}
    catch (IOException  e){ e.printStackTrace(); }}
    return st.nextToken(); } int nextInt() throws IOException{
    return Integer.parseInt(next());}
    long nextLong() throws IOException
    {return Long.parseLong(next());}
    double nextDouble()throws IOException { return Double.parseDouble(next()); }
    String nextLine() throws IOException{ String str = ""; try{
    str = br.readLine();} catch (IOException e){
    e.printStackTrace();} return str;}}
   
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
}

Measured memory_bytes: 66324