#include <bits/stdc++.h>
using namespace std;
long long n, m, k, i, j, a, ans;
pair<long long, long long> arr[151];
vector<long long> v[151];
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cin >> n >> m >> k;
  for (i = 1; i <= n; i++) {
    cin >> arr[i].first;
  }
  for (i = 1; i <= n; i++) {
    cin >> a;
    v[a].push_back(arr[i].first);
    arr[i].second = a;
  }
  for (i = 1; i <= m; i++) {
    sort(v[i].begin(), v[i].end());
    reverse(v[i].begin(), v[i].end());
  }
  for (i = 1; i <= k; i++) {
    cin >> a;
    if (v[arr[a].second][0] != arr[a].first) {
      ans++;
      for (j = 0; j < v[arr[a].second].size(); j++) {
        if (v[arr[a].second][j] == arr[a].first) {
          v[arr[a].second].erase(v[arr[a].second].begin() + j);
          break;
        }
      }
    }
  }
  cout << ans << '\n';
  return 0;
}
