#include <bits/stdc++.h>
using namespace std;
int a[1001];
int b[1001];
int c[1001];
set<pair<int, int> > my[111];
int main() {
  int n, m, k;
  cin >> n >> m >> k;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  for (int i = 1; i <= n; i++) {
    cin >> b[i];
    my[b[i]].insert(make_pair(a[i], i));
  }
  int kol = 0;
  for (int i = 1; i <= k; i++) {
    int x;
    cin >> x;
    int temp = b[x];
    pair<int, int> as = make_pair(a[x], x);
    set<pair<int, int> >::iterator it = my[temp].end();
    it--;
    if (*it != as) kol++;
  }
  cout << kol;
  return 0;
}
