#include <bits/stdc++.h>
#define int long long
#define rep(i, l, r) for (int i (l); i <= r; ++ i)
#define rrp(i, l, r) for (int i (r); i >= l; -- i)
#define pii pair <int, int>
#define eb emplace_back
#define ls p << 1
#define rs ls | 1
#define inf 1000000000000
using namespace std;
constexpr int N = 150 + 5, K = 10;
typedef unsigned long long ull;
typedef long long ll;
inline ll rd () {
  ll x = 0, f = 1;
  char ch = getchar ();
  while (! isdigit (ch)) {
    if (ch == '-') f = -1;
    ch = getchar ();
  }
  while (isdigit (ch)) {
    x = (x << 1) + (x << 3) + ch - 48;
    ch = getchar ();
  }
  return x * f;
}
int f[N][N], g1[N][N][K], g2[N][N][K][K];
int n, m, w;
int c[N], G[N];
int p[K << 1];
int val (int s) {
  if (s < m) return p[m] - (m - s) * w;
  return p[s];
}
signed main () {
  // freopen ("1.in", "r", stdin);
  // freopen ("1.out", "w", stdout);
  n = rd (), m = rd (), w = rd ();
  rep (i, 1, n) c[i] = rd ();
  rep (i, 1, n) G[i] = rd ();
  rep (i, m, m * 2 - 2) p[i] = rd ();
  rep (i, 0, n + 1) rep (j, 0, n + 1) {
    f[i][j] = -inf;
    rep (k, 0, m - 1) {
      g1[i][j][k] = -inf;
      rep (l, 0, m - 1) {
        g2[i][j][k][l] = -inf;
      }
    }
  }
  rep (i, 1, n + 1) f[i][i - 1] = 0;
  rep (len, 1, n) {
    rep (l, 1, n - len + 1) {
      int r = l + len - 1;
      if (c[r] != c[l - 1])
      f[l][r] = f[l][r - 1] + val (G[r]);
      g1[l][r][G[r]] = f[l][r - 1];
      rep (s1, 0, m - 1) {
        rep (k, l, r) {
          if (c[k] == c[r])
          g2[l][r][s1][G[r]] = max (g2[l][r][s1][G[r]], g1[l][k][s1] + f[k + 1][r - 1]);
          if (s1 >= G[r] && c[k] == c[r]) g1[l][r][s1] = max (g1[l][r][s1], g1[l][k][s1 - G[r]] + f[k + 1][r - 1]);
          rep (s2, 0, m - 1) {
            if (c[k] != c[l - 1] && c[k] != c[r + 1])
            f[l][r] = max (f[l][r], f[k + 1][r] + g2[l][k][s1][s2] + val (s1 + s2));
            if (s2 >= G[r] && c[k] == c[r])
            g2[l][r][s1][s2] = max (g2[l][r][s1][s2], g2[l][k][s1][s2 - G[r]] + f[k + 1][r - 1]);
          }
        }
      }
    }
  }
  // cout<<g[1][n][]
  cout << f[1][n];
}