n = int(input())
A = []
res = 0
for i in range(n):
    s = list(input())
    A.append(s)
for i in range(n):
    for j in range(n):
        if i == 0 or j == 0 or i == n - 1 or j == n - 1:
            continue
        elif A[i][j] == 'X' and A[i - 1][j - 1] == 'X' and A[i - 1][j + 1] == 'X' and A[i + 1][j - 1] == 'X' and A[i + 1][j + 1] == 'X':
            res += 1
print(res)