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

@SuppressWarnings("unused")
public class Main {

  private static void solve() {
    int n = ni() * 2;
    int k = ni();
    int[] a = new int[n];
    int[] c = new int[n];
    for (int i = 0; i < n / 2; i++) {
      a[i] = a[i + n / 2] = ni();
    }
    for (int i = 0; i < n / 2; i++) {
      c[i] = c[i + n / 2] = ni();
    }

    long[][] dp = new long[n][n + 1];

    long ret = 0;
    for (int len = 1; len <= n / 2; len++) {
      for (int l = 0; l < n; l++) {
        int r = l + len;
        if (r > n)
          continue;
        if (len == 1) {
          dp[l][r] = 1L << c[l];
        } else {
          for (int j = l + 1; j < r; j++) {
            for (int d = 0; d <= k; d++) {
              dp[l][r] |= dp[l][j] & (dp[j][r] << d);
              dp[l][r] |= dp[l][j] & (dp[j][r] >> d);
              dp[l][r] |= (dp[l][j] << d) & dp[j][r];
              dp[l][r] |= (dp[l][j] >> d) & dp[j][r];
            }
          }
        }
      }
    }

    for (int l = 0; l < n; l++) {
      for (int r = l + 1; r <= n; r++) {
        long cur = 0;
        if (Long.bitCount(dp[l][r]) > 0) {
          for (int s = l; s < r; s++) {
            cur += a[s];
          }
          ret = Math.max(ret, cur);
        }
      }
    }
    // 28 11 32 60 53 6 28 96 8 23 19 76 62 76
    // 19 5 3 11 14 5 3 19 10 10 16 13 3 8
    //System.out.println(Arrays.deepToString(dp));
    System.out.println(ret);
  }

  public static void main(String[] args) {
    new Thread(null, new Runnable() {
      @Override
      public void run() {
        solve();
        out.flush();
      }
    }, "", 64000000).start();
  }

  private static PrintWriter out = new PrintWriter(System.out);
  private static StringTokenizer tokenizer = null;
  private static BufferedReader reader = new BufferedReader(new InputStreamReader(System.in), 32768);

  public static String next() {
    while (tokenizer == null || !tokenizer.hasMoreTokens()) {
      try {
        tokenizer = new java.util.StringTokenizer(reader.readLine());
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
    return tokenizer.nextToken();
  }

  private static double nd() {
    return Double.parseDouble(next());
  }

  private static long nl() {
    return Long.parseLong(next());
  }

  private static int[] na(int n) {
    int[] a = new int[n];
    for (int i = 0; i < n; i++)
      a[i] = ni();
    return a;
  }

  private static char[] ns() {
    return next().toCharArray();
  }

  private static long[] nal(int n) {
    long[] a = new long[n];
    for (int i = 0; i < n; i++)
      a[i] = nl();
    return a;
  }

  private static int[][] ntable(int n, int m) {
    int[][] table = new int[n][m];
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < m; j++) {
        table[i][j] = ni();
      }
    }
    return table;
  }

  private static int[][] nlist(int n, int m) {
    int[][] table = new int[m][n];
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < m; j++) {
        table[j][i] = ni();
      }
    }
    return table;
  }

  private static int ni() {
    return Integer.parseInt(next());
  }
}