import sys

flip = lambda a: [[a[j][i] for j in range (n)] for i in range (n)]
rotate90 = lambda a: [[a[j][n - i - 1] for j in range (n)] for i in range (n)]

n = int (sys.stdin.readline ())
a = [list (sys.stdin.readline ().strip ()) for i in range (n)]
b = flip (a)
res = 0
for i in range (4):
    res += (a == b)
    b = rotate90 (b)
print (res)