import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        int k = sc.nextInt();
        int[] colors = new int[n];
        for (int i = 0; i < n; i++) {
            colors[i] = sc.nextInt() - 1;
        }
        long[] costs = new long[m];
        long[] colorCosts = new long[m];
        for (int i = 0; i < m; i++) {
            costs[i] = sc.nextInt();
            colorCosts[i] = costs[i] * k;
        }
        for (int i = 0; i < k; i++) {
            colorCosts[colors[i]] -= costs[colors[i]];
        }
        long ans = Long.MAX_VALUE;
        for (long x : colorCosts) {
            ans = Math.min(ans, x);
        }
        for (int i = k; i < n; i++) {
            colorCosts[colors[i - k]] += costs[colors[i - k]];
            colorCosts[colors[i]] -= costs[colors[i]];
            ans = Math.min(ans, colorCosts[colors[i]]);
        }
        System.out.println(ans);
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}