using System.Collections.Generic;
using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var m = int.Parse(line[1]);
        var k = int.Parse(line[2]);
        line = Console.ReadLine().Trim().Split(' ');
        var c = Array.ConvertAll(line, x=> int.Parse(x) -1);
        line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        getAns(n, m, k, c,a);
    }
    static void getAns(int n, int m, int k, int[] c, int[] a)
    {
        var d = new Dictionary<int, int>();
        for (int i = 0; i < k; i++)
        {
            if (d.ContainsKey(c[i])) d[c[i]]++;
            else d[c[i]] = 1;
        }
        var ans = long.MaxValue;
        foreach(var x in d)
        {
            var tempcost = (k - x.Value) *(long) a[x.Key];
            if (tempcost == 0) { Console.WriteLine(0); return; }
            ans = Min (ans,tempcost);
        }
        for (int i = 0; i < n -k; i++)
        {
            d[c[i]]--;
            var nkey = c[i + k];
            if (d.ContainsKey(nkey)) d[nkey]++;
            else d[nkey] = 1;
            var tempcost = (k - d[nkey]) * (long)a[nkey];
            if (tempcost == 0) { Console.WriteLine(0); return; }
            ans = Min(ans, tempcost);
        }
        Console.WriteLine(ans);
    }
}