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 10
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 6
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 5
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 2
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7 5 541 10 10 4 4 1 21 5 9 93 21 3
def proizv(s, s_1):
    s_2 = ''
    for i in s:
        s_2 += s_1 + i
    return s_2 + s_1


def beaty(s):
    c = 1
    max_c = 1
    s += '1'
    l = '1'
    for i in s:
        if i == l:
            c += 1
        else:
            if max_c < c:
                max_c = c
                c = 1
        l = i
    return max_c


n = int(input())
t = input()
for i in range(n - 1):
    s = input()
    t = proizv(t, s)
print(beaty(t))