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 int[m];
        for (int i = 0; i < k; i++) d[c[i]]++;
        var ans = long.MaxValue;
        for (int i = 0; i < m; i++)
        {
            var tempcost = (k - d[i]) * (long)a[i];
            ans = Min(ans, tempcost);
        }
        for (int i = 0; i < n - k; i++)
        {
            d[c[i]]--;
            d[c[i + k]]++;
            var tempcost = (k - d[i + k]) * (long)a[i];
            ans = Min(ans, tempcost);
        }
        Console.WriteLine(ans);
    }
}