#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
char a[512][512];
int main()
{
    int n;
    scanf("%d", &n);
    for (int i = 1; i <= n; i++)
        scanf("%s", a[i] + 1);
    int cnt = 0;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= n; j++)
            if (a[i][j] == 'X' && a[i - 1][j - 1] == 'X' && a[i - 1][j + 1] == 'X' && a[i + 1][j - 1] == 'X' && a[i + 1][j + 1] == 'X')
                cnt++;
    printf("%d", cnt);
    return 0;
}