#include <bits/stdc++.h>
using namespace std;
const int MOD = 1000000007;
double PI = 4 * atan(1);
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n, m, k;
  cin >> n >> m >> k;
  int pow[110] = {};
  int sch[110] = {};
  int mpw[110] = {};
  int idpw[110] = {};
  for (int i = 1; i < n + 1; i++) {
    cin >> pow[i];
  }
  for (int i = 1; i < n + 1; i++) {
    cin >> sch[i];
  }
  int cone[110] = {};
  for (int i = 0; i < k; i++) {
    cin >> cone[i];
  }
  for (int i = 1; i < n + 1; i++) {
    if (pow[i] > mpw[sch[i]]) {
      mpw[sch[i]] = pow[i];
      idpw[sch[i]] = i;
    }
  }
  int num = 0;
  for (int i = 0; i < k; i++) {
    if (idpw[sch[cone[i]]] != cone[i]) {
      num += 1;
    }
  }
  cout << num << '\n';
  ;
}
