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();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, m, k) = (c[0], c[1], c[2]);
        c = NList;
        for (var i = 0; i < c.Length; ++i) --c[i];
        var a = NList;
        var counts = new int[m];
        for (var i = 0; i < k; ++i) ++counts[c[i]];
        var maxs = (int[]) counts.Clone();
        for (var i = k; i < n; ++i)
        {
            ++counts[c[i]];
            --counts[c[i - k]];
            maxs[c[i]] = Math.Max(maxs[c[i]], counts[c[i]]);
        }
        var ans = long.MaxValue;
        for (var i = 0; i < m; ++i) ans = Math.Min(ans, (long)a[i] * (k - maxs[i]));
        WriteLine(ans);
    }
}