#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
//---------------------------------------------------------------------------------------------------
/*---------------------------------------------------------------------------------------------------
　　　　　　　　　　　 ∧＿∧  
　　　　　 ∧＿∧ 　（´<_｀ ）　 Welcome to My Coding Space!
　　　　 （ ´_ゝ`）　/　 ⌒i     
　　　　／　　　＼　 　  |　|     
　　　 /　　 /￣￣￣￣/　　|  
　 ＿_(__ﾆつ/　    ＿/ .| .|＿＿＿＿  
　 　　　＼/＿＿＿＿/　（u　⊃  
---------------------------------------------------------------------------------------------------*/




int N;
string S[101];
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> N;
    rep(y, 0, N) cin >> S[y];
    int ans = 0;

    rep(i, 0, 2) {
        rep(y, 0, N) rep(x, y + 1, N) swap(S[y][x], S[x][y]);

        // 1 : 全部縦
        {
            int cnt = 0;
            rep(x, 0, N) {
                int ok = 0;
                int c = 0;
                rep(y, 0, N - 1) if (S[y][x] == '.') c++;
                if (c == N - 1) ok = 1;
                c = 0;
                rep(y, 1, N) if (S[y][x] == '.') c++;
                if (c == N - 1) ok = 1;
                if (ok) cnt++;
            }
            chmax(ans, cnt);
        }

        // 2 : 縦+上
        {
            int cnt = 0;
            rep(x, 0, N) {
                int ok = 0;
                int c = 0;
                rep(y, 1, N) if (S[y][x] == '.') c++;
                if (c == N - 1) ok = 1;
                if (ok) cnt++;
            }
            int ok = 0, c;
            c = 0;
            rep(x, 0, N - 1) if (S[0][x] == '.') c++;
            if (c == N - 1) ok = 1;
            c = 0;
            rep(x, 1, N) if (S[0][x] == '.') c++;
            if (c == N - 1) ok = 1;
            if (ok) cnt++;
            chmax(ans, cnt);
        }

        // 3 : 縦+下
        {
            int cnt = 0;
            rep(x, 0, N) {
                int ok = 0;
                int c = 0;
                rep(y, 0, N - 1) if (S[y][x] == '.') c++;
                if (c == N - 1) ok = 1;
                if (ok) cnt++;
            }
            int ok = 0, c;
            c = 0;
            rep(x, 0, N - 1) if (S[N - 1][x] == '.') c++;
            if (c == N - 1) ok = 1;
            c = 0;
            rep(x, 1, N) if (S[N - 1][x] == '.') c++;
            if (c == N - 1) ok = 1;
            if (ok) cnt++;
            chmax(ans, cnt);
        }
    }

    // 特殊パターン
    {
        int cnt = 0, c;

        c = 0;
        rep(y, 0, N - 1) if (S[y][0] == '.') c++;
        if (c == N - 1) cnt++;
        c = 0;
        rep(x, 0, N - 1) if (S[N - 1][x] == '.') c++;
        if (c == N - 1) cnt++;
        c = 0;
        rep(y, 1, N) if (S[y][N - 1] == '.') c++;
        if (c == N - 1) cnt++;
        c = 0;
        rep(x, 1, N) if (S[0][x] == '.') c++;
        if (c == N - 1) cnt++;

        chmax(ans, cnt);
    }

    rep(y, 0, N) rep(x, 0, N / 2) swap(S[y][x], S[y][N - 1 - x]);

    {
        int cnt = 0, c;

        c = 0;
        rep(y, 0, N - 1) if (S[y][0] == '.') c++;
        if (c == N - 1) cnt++;
        c = 0;
        rep(x, 0, N - 1) if (S[N - 1][x] == '.') c++;
        if (c == N - 1) cnt++;
        c = 0;
        rep(y, 1, N) if (S[y][N - 1] == '.') c++;
        if (c == N - 1) cnt++;
        c = 0;
        rep(x, 1, N) if (S[0][x] == '.') c++;
        if (c == N - 1) cnt++;

        chmax(ans, cnt);
    }

    cout << ans << endl;
}