#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, k;
  cin >> n >> m >> k;
  int a[n], b[n], c[k];
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  for (int i = 0; i < n; i++) {
    cin >> b[i];
  }
  for (int i = 0; i < k; i++) {
    cin >> c[i];
  }
  int ans = 0;
  for (int i = 0; i < k; i++) {
    int x = c[i] - 1, s = b[x], p = a[x], ma = x;
    for (int j = 0; j < n; j++) {
      if (b[j] == s && a[j] > p) {
        ma = j;
        break;
      }
    }
    if (ma != x) ans++;
  }
  cout << ans << "\n";
  return 0;
}
