#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < int(n); i++) {
    cin >> a[i];
  }
  vector<vector<int>> g(n);
  for (int i = 0; i < int(n - 1); i++) {
    int p;
    cin >> p;
    p--;
    g[p].push_back(i + 1);
  }
  vector<int> color(n);
  function<void(int)> dfs = [&](int u) {
    for (const auto& v : g[u]) {
      color[v] = color[u] ^ 1;
      dfs(v);
    }
  };
  dfs(0);
  int WHITE = 0;
  for (int i = 0; i < int(n); i++) {
    if (g[i].empty()) {
      WHITE = color[i];
    }
  }
  int nim_sum = 0;
  map<int, int> freq;
  for (int i = 0; i < int(n); i++) {
    if (color[i] == WHITE) {
      nim_sum ^= a[i];
      ++freq[a[i]];
    }
  }
  long long ans = 0;
  if (nim_sum == 0) {
    int cnt = 0;
    for (int i = 0; i < int(n); i++) {
      if (color[i] != WHITE) {
        cnt++;
      }
    }
    ans = (long long)cnt * (cnt - 1) / 2 +
          (long long)(n - cnt) * (n - cnt - 1) / 2;
  }
  for (int i = 0; i < int(n); i++) {
    if (color[i] != WHITE) {
      ans += freq[nim_sum ^ a[i]];
    }
  }
  cout << ans << endl;
}
