n=int(input())
s=[input()for i in range(n)]
C=[".",*"A"*~-n]
r=sum(C==sorted(i)for i in s)+sum(C==sorted(i)for i in zip(*s))
c=d=""
for i in range(n):c+=s[i][i];d+=s[i][~i]
print(r+(C==sorted(c))+(C==sorted(d)))