function getLines(input){
	return input.split("\n").map((s)=>s.trim())
}
function parseLine(line){
	return line.split(" ").map((s)=>s.trim());
}
function parseLineToInt(line){
	return line.split(" ").map((s)=>parseInt(s.trim()));
}

// parameter "input" gets all data
function Main(input) {
	// the first line is assigned to input[0], the second line is assigned to input[1] similarly.	
	input = getLines(input).map(parseLineToInt);
	var X = input[0][0];
	var Y = input[0][1];
	var A = input[0][2]-1;
	var B = input[0][3]-1;
	var C = input[0][4]-1;
	var p = input[1];
	var q = input[2];	
	var r = input[3];
	p.sort();
	q.sort();
	r.sort();
	var ans = 0;
	for (var i = 0; i < X; i++) {
		ans += p[A-i];
	}
	var pa = A-X+1;
	for (var j = 0; j < Y; j++) {
		ans += q[B-j];
	}
	var pb = B-Y+1;
	for(var i=C;i>=0;i--){
		if(pa==A || pb==B){
			if(pa==A){
				if(r[i]>q[pb]){
					ans =ans +r[i]-q[pb];
					pb++;
				}else{
					break;
				}

			}else{
				if(r[i]>q[pb]){
					ans =ans +r[i]-p[pa];
					pa++;
				}else{
					break;
				}
			}
		}else{
			if(r[i]>Math.min(p[pa],q[pb])){
				if(q[pb]>p[pa]){
					ans =ans +r[i]-p[pa];
					pa++;
				}else{
					ans =ans +r[i]-q[pb];
					pb++;
				}
			}else{
				break;
			}
		}
	}
	console.log(ans);
}

// Don't edit this line!
//Main(require("fs").readFileSync(__dirname+'/in.txt', "utf8"));
Main(require('fs').readFileSync('/dev/stdin', 'utf8'));
