using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    static int[] NMi => ReadLine().Split().Select(c => int.Parse(c) - 1).ToArray();
    static int[][] NMap(int n) => Enumerable.Repeat(0, n).Select(_ => NMi).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, m) = (c[0], c[1]);
        var a = NList;
        var b = NList;
        c = NList;
        var sum = 0L;
        foreach (var ci in c) sum += ci;
        var dic = new Dictionary<long, long>();
        dic[a[0]] = c[0];
        var sub = 0L;
        for (var i = 1; i < n; ++i)
        {
            sub += b[(i - 1) % m];
            var ta1 = a[i] - sub;
            if (dic.ContainsKey(ta1)) dic[ta1] += c[i];
            else dic[ta1] = c[i];
        }
        var ans = long.MaxValue;
        foreach (var kv in dic) ans = Math.Min(ans, sum - kv.Value);
        WriteLine(ans);
    }
}