N = int(input())
s = [[x for x in input()] for _ in range(N)]

s[0] = [x if x != '-' else 'o' for x in s[0]]
for i in range(1,N):
    s[i][0] = s[i][0] if s[i][0] != '-' else 'x'

for i in range(1,N):
    if s[i].count('o') > s[0].count('o'):
        s[i] = [x if x != '-' else 'o' for x in s[i]]
        for j in range(N):
            s[j][i] = s[j][i] if s[j][i] != '-' else 'x'

_, *t = s
c = [i+1 for i,_ in list(sorted(enumerate([x.count('o') for x in t]), key=lambda x: x[1]))]

for i in c:
    for j in range(N):
        if i == j:
            s[i] = [x if x != '-' else 'o' for x in s[i]]
        else:
            s[j][i] = s[j][i] if s[j][i] != '-' else 'x'

wc = [x.count('o') for x in s]
ans = 1
for i in range(1, N):
    if wc[i] > wc[0]:
        ans += 1
print(ans)