//include,using,define等
#pragma region header
#include <algorithm>
#include <bitset>
#include <tuple>
#include <cstdint>
#include <cctype>
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <limits>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include <math.h>
#include <cstring>

// ===============================================================
//using系
#pragma region header
using namespace std;
using ll = long long;
using lint = long long;
using vl = vector<long long>;
using vvl = vector<vector<long long>>;
using vvi = vector<vector<int>>;
using vs = vector<string>;
using vc = vector<char>;
using vcc = vector<vector<char>>;
using vm = vector<short>;
using vmm = vector<vector<short>>;
using pii = pair<int, int>;
using psi = pair<string, int>;
using ld = long double;
using ull = unsigned long long;
using ui = unsigned int;
using qul = queue<ll>;
using pql = priority_queue<ll>;
const int dx[] = { 1,0,-1,0 };
const int dy[] = { 0,1,0,-1 };
constexpr ll mod = 1e9 + 7;
constexpr long double pi = 3.141592653589793238462643383279;
#pragma endregion
// ========================================================================
//define
#pragma region header
//#define int long long
#define rep(i, n) for(ll i = 0; i < n; i++)
#define REP(i, n) for(ll i = 1; i <= n; i++)
#define INF (ll)10000000000000000
#define P pair<lint,lint>
template <class T>
bool chmax(T & a, const T & b) {
	if (a < b) {
		a = b;  // aをbで更新
		return true;
	}
	return false;
}
template <class T>
bool chmin(T& a, const T& b) {
	if (a > b) {
		a = b;  // aをbで更新
		return true;
	}
	return false;
}
#pragma endregion
#pragma endregion
//整数系ライブラリ
#pragma region header
ll gcd(ll a, ll b)
{
	if (a % b == 0)
	{
		return(b);
	}
	else
	{
		return(gcd(b, a % b));
	}
}
//最大公約数
ll lcm(ll a, ll b)
{
	return a * b / gcd(a, b);
}
//最小公倍数
ll box(double a)
{
	ll b = a;
	return b;
}
//切り捨て
ll fff(double a)
{
	ll b = a + 0.5;
	return b;
}
//四捨五入
ll mch(ll n) {
	if (n == 1) return 1;
	else return n * mch(n - 1);
}
//1から整数nまでの階乗を出す(INFで割っていない)
bool prime(ll a)//素数判定、primeならtrue,違うならfalse
{
	if (a < 2) return false;
	else if (a == 2) return true;
	else if (a % 2 == 0) return false;
	double m = sqrt(a);
	for (int i = 3; i <= m; i += 2)
	{
		if (a % i == 0)
		{
			return false;
		}
	}

	// 素数である
	return true;
}
//素数判定
ll modpow(ll a, ll n, ll mod) {
	ll hi = 1;
	while (n > 0) {
		if (n & 1) hi = hi * a % mod;
		a = a * a % mod;
		n >>= 1;
	}
	return hi;
}
//いろいろやります（ただの前座）
ll modinv(ll a, lint mod) {
	return modpow(a, mod - 2, mod);
}
//割り算の10^9+7等対策で逆元を出します 
ll num(ll a) {
	string s = to_string(a);
	ll sum = 0;
	for (int j = 0; j < s.size(); ++j) {
		sum += (ll)s[j] - '0';
	}
	return sum;
}
//整数aのすべての桁の和
#pragma endregion
//グラフ・木系ライブラリ
#pragma region header
//UnionFind
class UnionFind {
	vector<int> par;

	UnionFind(int n) : par(n, -1) { }
	void init(int n) { par.assign(n, -1); }

	int root(int x) {//根を出す
		if (par[x] < 0) return x;
		else return par[x] = root(par[x]);
	}

	bool same(int x, int y) {//同じ集合なのかを調べる
		return root(x) == root(y);
	}

	bool unite(int x, int y) {//xの根とyの根をつなげる
		x = root(x); y = root(y);
		if (x == y) return false;
		if (par[x] > par[y]) swap(x, y);
		par[x] += par[y];
		par[y] = x;
		return true;
	}

	int size(int x) {
		return -par[root(x)];
	}
};
//最短経路系
struct Edge {
	lint to;
	lint cost;
};//to...辺 cost...重み これをそれぞれ隣接グラフとして格納
using Graph = vector<vector<Edge>>;
void dijkstra(const Graph &G, lint s, vector<lint> &dis) {//Gは隣接グラフ,sは始点,距離の結果をdisに格納
	lint N = G.size();
	dis.resize(N, INF);
	priority_queue<P, vector<P>, greater<P>> pq;  //仮の最短距離, 頂点」が小さい順に並ぶ
	dis[s] = 0;
	pq.emplace(dis[s], s);
	while (!pq.empty()) {//
		P p = pq.top();
		pq.pop();
		int v = p.second;
		if (dis[v] < p.first) {  //最短距離だけ
			continue;
		}
		for (auto& e : G[v]) {
			if (dis[e.to] > dis[v] + e.cost) {  // 最短距離...priority_queue
				dis[e.to] = dis[v] + e.cost;
				pq.emplace(dis[e.to], e.to);
			}
		}
	}
	return;
}

// ========================================================================
#pragma endregion
//library・end//
//ここから問題ごとに書く


int main(void) {
	lint x, y, a, b, c; cin >> x >> y >> a >> b >> c;
	vl d(a);
	vl e(b);
	for (int i = 0; i < a; i++) 
		cin >> d[i];
	for (int i = 0; i < b; i++)
		cin >> e[i];
	sort(d.begin(), d.end());
	sort(e.begin(), e.end());
	reverse(d.begin(), d.end());
	reverse(e.begin(), e.end());
	vl f;
	for (int i = 0; i < c; i++) {
		lint z; cin >> z;
		f.push_back(z);
	}
	for (int i = 0; i < x; i++)
		f.push_back(d[i]);
	for (int i = 0; i < y; i++)
		f.push_back(e[i]);
	sort(f.begin(), f.end());
	reverse(f.begin(), f.end());
	lint ans = 0;
	for (int i = 0; i < x + y; i++)
		ans += f[i];
	printf("%lld\n", ans);

	return 0;
}

Measured memory_bytes: 9068