using System.Linq;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var k = int.Parse(line[1]);
        line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, long.Parse);
        line = Console.ReadLine().Trim().Split(' ');
        var b = Array.ConvertAll(line, long.Parse);
        line = Console.ReadLine().Trim().Split(' ');
        var c = Array.ConvertAll(line, long.Parse);
        getAns(n, k, a, b, c);
    }
    static void getAns(int n, int k, long[] a, long[] b, long[] c)
    {
        var d = new long[n];
        for (int i = 0; i < n; i++) d[i] = b[i] - c[i];
        var ans = a.Sum() + c.Sum() + d.OrderByDescending(x => x).Take(k).Sum();
        Console.WriteLine(ans);
    }
}