#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, k;
  cin >> n >> m >> k;
  vector<pair<int, int>> vec(n);
  for (int i = 0; i < n; i++) {
    cin >> vec[i].first;
  }
  for (int i = 0; i < n; i++) {
    cin >> vec[i].second;
  }
  vector<vector<pair<int, int>>> table(m + 1);
  for (int i = 0; i < n; i++) {
    int x = vec[i].second;
    table[x].push_back(make_pair(vec[i].first, i + 1));
  }
  vector<int> team(m + 1);
  for (int i = 1; i <= m; i++) {
    int x = 0;
    int y = 0;
    for (int j = 0; j < table[i].size(); j++) {
      if (table[i][j].first > x) {
        y = table[i][j].second;
        x = table[i][j].first;
      }
    }
    team[i] = y;
  }
  int count = 0;
  for (int i = 0; i < k; i++) {
    int x;
    cin >> x;
    x--;
    int xschool = vec[x].second;
    int teamnum = team[xschool] - 1;
    if (vec[teamnum].first != vec[x].first) {
      count++;
    }
  }
  cout << count << endl;
}
