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();
        long[] values = new long[n];
        for (int i = 0; i < n; i++) {
            values[i] = sc.nextInt();
        }
        long[] div = new long[m];
        for (int i = 0; i < m; i++) {
            div[i] = sc.nextInt();
        }
        int[] costs = new int[n];
        long total = 0;
        for (int i = 0; i < n; i++) {
            costs[i] = sc.nextInt();
            total += costs[i];
        }
        long current = 0;
        HashMap<Long, Long> saves = new HashMap<>();
        for (int i = 0; i < n; i++) {
            long tmp = values[i] - current;
            saves.put(tmp, saves.getOrDefault(tmp, 0L) + costs[i]);
            current += div[i % m];
        }
        long ans = 0;
        for (long x : saves.values()) {
            ans = Math.max(ans, x);
        }
        System.out.println(total - 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();
    }
    
}