#include <bits/stdc++.h>
using namespace std;
template <typename S, typename T>
ostream& operator<<(ostream& out, pair<S, T> const& p) {
  out << '(' << p.first << ", " << p.second << ')';
  return out;
}
template <typename T>
ostream& operator<<(ostream& out, vector<T> const& v) {
  long long l = v.size();
  for (long long i = 0; i < l - 1; i++) out << v[i] << ' ';
  if (l > 0) out << v[l - 1];
  return out;
}
template <typename T>
void trace(const char* name, T&& arg1) {
  cout << name << " : " << arg1 << "\n";
}
template <typename T, typename... Args>
void trace(const char* names, T&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  cout.write(names, comma - names) << " : " << arg1 << " | ";
  trace(comma + 1, args...);
}
long long n;
vector<string> arr;
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  cin >> n;
  for (long long i = 0; i < n; i++) {
    string temp;
    cin >> temp;
    arr.push_back(temp);
  }
  long long ans = 0;
  for (long long i = 1; i < n - 1; i++) {
    for (long long j = 1; j < n - 1; j++) {
      if (arr[i][j] == arr[i - 1][j - 1] && arr[i][j] == arr[i - 1][j + 1] &&
          arr[i][j] == arr[i + 1][j - 1] && arr[i][j] == arr[i + 1][j + 1] &&
          arr[i][j] == 'X') {
        ans++;
      }
    }
  }
  cout << ans << "\n";
}
