#include<bits/stdc++.h>
#include<atcoder/all>

using namespace std;

using int64 = long long;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
  }
} iosetup;

template< typename T1, typename T2 >
ostream &operator<<(ostream &os, const pair< T1, T2 >& p) {
  os << p.first << " " << p.second;
  return os;
}

template< typename T1, typename T2 >
istream &operator>>(istream &is, pair< T1, T2 > &p) {
  is >> p.first >> p.second;
  return is;
}

template< typename T >
ostream &operator<<(ostream &os, const vector< T > &v) {
  for(int i = 0; i < (int) v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template< typename T >
istream &operator>>(istream &is, vector< T > &v) {
  for(T &in : v) is >> in;
  return is;
}

template< typename T1, typename T2 >
inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }

template< typename T1, typename T2 >
inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

template< typename T = int64 >
vector< T > make_v(size_t a) {
  return vector< T >(a);
}

template< typename T, typename... Ts >
auto make_v(size_t a, Ts... ts) {
  return vector< decltype(make_v< T >(ts...)) >(a, make_v< T >(ts...));
}

template< typename T, typename V >
typename enable_if< is_class< T >::value == 0 >::type fill_v(T &t, const V &v) {
  t = v;
}

template< typename T, typename V >
typename enable_if< is_class< T >::value != 0 >::type fill_v(T &t, const V &v) {
  for(auto &e : t) fill_v(e, v);
}

template< typename F >
struct FixPoint : F {
  explicit FixPoint(F &&f) : F(forward< F >(f)) {}

  template< typename... Args >
  decltype(auto) operator()(Args &&... args) const {
    return F::operator()(*this, forward< Args >(args)...);
  }
};

template< typename F >
inline decltype(auto) MFP(F &&f) {
  return FixPoint<F>{forward<F>(f)};
}


int main() {
  int N;
  cin >> N;
  vector< string > S(N);
  cin >> S;
  auto check = [&](int y, int x) {
    bool f = false;
    for(int i = 0; i < N; i++) {
      if(S[i][x] != 'A') f = true;
    }
    if(not f) return true;
    f = false;
    for(int i = 0; i < N; i++) {
      if(S[y][i] != 'A') f = true;
    }
    if(not f) return true;
    if(y == x) {
      f = false;
      for(int i = 0; i < N; i++) {
        if(S[i][i] != 'A') f = true;
      }
      if(not f) return true;
    }
    if(y == N - x - 1) {
      f = false;
      for(int i = 0; i < N; i++) {
        if(S[i][N - i - 1] != 'A') f = true;
      }
      if(not f) return true;
    }
    return false;
  };
  int ret = 0;
  for(int i = 0; i < N; i++) {
    for(int j = 0; j < N; j++) {
      if(S[i][j] == '.') {
        S[i][j] = 'A';
        ret += check(i, j);
        S[i][j] = '.';
      }
    }
  }
  cout << ret << endl;
}