def f(n):
    ans = 0
    while n > 0:
        ans += n % 10
        n //= 10
    return ans
file = open('16B.txt')
n = int(file.readline())
A = []
s = set()
for i in range(n):
    A += [int(file.readline())]
    s.add(f(A[-1]))
ans = 0
for elem in s:
    count = 0
    for i in range(n):
        if f(A[i]) == elem:
            count += 1
    ans = max(ans, count)
print(ans)