#include <bits/stdc++.h>
using namespace std;
int n, m, k, power[105], school[105];
int cmp(int x, int y) { return power[x] > power[y]; }
int main() {
  cin >> n >> m >> k;
  for (int i = 1; i <= n; ++i) cin >> power[i];
  vector<int> students[105];
  for (int i = 1; i <= n; ++i) {
    int x;
    cin >> x;
    students[x].push_back(i);
    school[i] = x;
  }
  for (int i = 1; i <= m; ++i)
    sort(students[i].begin(), students[i].end(), cmp);
  int ans = 0;
  for (int i = 1; i <= k; ++i) {
    int chosen;
    cin >> chosen;
    if (students[school[chosen]][0] != chosen) ++ans;
  }
  cout << ans;
  return 0;
}
