#include <bits/stdc++.h>
#include <unistd.h>
#include <sys/time.h>
#include <stdlib.h>
 
using namespace std;
 
typedef long long ll;
typedef pair<ll,ll> P;
typedef pair<P, ll> T;
 
long long int INF = 1e18;
const ll fact_table = 1200008;
double Pi = 3.1415926535897932384626;

priority_queue <ll> pql;
priority_queue <P> pqp;
priority_queue <P> bag;
//big priority queue
priority_queue <ll,vector<ll>,greater<ll> > pqls;
priority_queue <P,vector<P>,greater<P> > pqps;
//small priority queue
//top pop
 
ll dx[8]={1,0,-1,0,1,1,-1,-1};
ll dy[8]={0,1,0,-1,1,-1,-1,1};
char dir[] = "DRUL";
//↓,→,↑,←
 
 
#define p(x) cout<<x<<"\n";
#define el cout<<endl;
#define pe(x) cout<<(x)<<" ";
#define ps(x) cout<<fixed<<setprecision(25)<<x<<endl;
#define pu(x) cout<<(x);
#define pb push_back
// #define lb lower_bound
#define ub upper_bound
#define CLEAR(a) a = decltype(a)(); 
#define pc(x) cout << x << ",";
 
 
ll mod = 998244353;
// ll mod = 1000000007;
  
ll mypow(ll number1,ll number2, ll mod){
 
    if(number2 == 0){
        return 1;
    }else{
        ll number3 = mypow(number1,number2 / 2, mod);
        number3 *= number3;
        number3 %= mod;
        if(number2%2==1){
            number3 *= number1;
            number3 %= mod;
        }
        return number3;
    }
}
ll rui(ll number1,ll number2){
 
    if(number2 == 0){
        return 1;
    }else{
        ll number3 = rui(number1,number2 / 2);
        number3 *= number3;
        number3 %= mod;
        if(number2%2==1){
            number3 *= number1;
            number3 %= mod;
        }
        return number3;
    }
}
ll gcd(ll number1,ll number2){
 
    if(number1 > number2){
        swap(number1,number2);
    }
    if(number1 == 0 || number1 == number2){
        return number2;
    }else{
        return gcd(number2 % number1,number1);
    }
}
void YES(bool condition){
 
    if(condition){
        p("YES");
    }else{
        p("NO");
    }
    return;
}
void Yes(bool condition){
 
    if(condition){
        p("Yes");
    }else{
        p("No");
    }
    return;
}
 
/*
ll fact[fact_table + 5],rfact[fact_table + 5]; 
 
void c3_init(){
    fact[0] = rfact[0] = 1;
    for(ll i=1; i<=fact_table; i++){
        fact[i] = (fact[i-1]*i) % mod;
    }
    rfact[fact_table] = rui(fact[fact_table],mod - 2);
    for(ll i=fact_table; i>=1; i--){
       rfact[i-1] = rfact[i] * i;
       rfact[i-1] %= mod;
    }
    return;}
ll c3(ll n,ll r){
    return (((fact[n] * rfact[r]) % mod ) * rfact[n-r]) % mod;}
*/
bool multicase = false;

ll n,m,num,sum,a,b,c,d,e,h,q,p;
ll w, ans;
ll k;
ll x[500005], y[500005], z[500005];
string s, t;

void solve(){
    ll r1, r2;
    cin >> r1 >> r2 >> a >> b >> c;
    for(ll i=0;i<a;i++){
        cin >> x[i];
    }
    for(ll i=0;i<b;i++){
        cin >> y[i];
    }
    for(ll i=0;i<c;i++){
        cin >> z[i];
    }
    sort(x, x + a);
    reverse(x, x + a);
    sort(y, y + b);
    reverse(y, y + b);
    sort(z, z + c);
    reverse(z, z + c);
    for(ll i=r2;i<b;i++)y[i] = -INF;
    y[b] = -INF; z[c] = -INF;

    ll ans = -INF;
    
    ll suma = 0;
    for(ll i=0;i<r1;i++){
        suma += x[i];
    }
    ll sumb = 0, sumc = 0;
    ll idx1 = 0, idx2 = 0;
    ll useb = 0, usec = 0;
    for(ll i=r1;i>=0;i--){
        ll usea = i;
        if(usea + b + c < r1 + r2)break;

        while(usea + useb + usec < r1 + r2){

            if (y[idx1] > z[idx2]){
                useb ++;
                sumb += y[idx1];
                idx1++;
            } else {
                usec++;
                sumc += z[idx2];
                idx2++;
            }
        }
        ans = max(ans, suma + sumb + sumc);
        // p(suma + sumb + sumc);
        if (i > 0) suma -= x[i-1];
    }
    p(ans);

    return;
}

int main(){
    // init();
    // ios::sync_with_stdio(false);
    // cin.tie(nullptr);
    ll q;
    if(multicase){
        cin >> q;
    }else{
        q = 1;
    }
    while(q--){
        solve();
    }
    return 0;

}


















Measured memory_bytes: 9216