# coding: utf-8
# Your code here!
from collections import Counter

class Counters():
    def __init__ (self, chars):
        self.x = chars
    def count_x (self, x, y):
        ans = []
        for lst in self.x:
            count_num = 0
            for chars in lst:
                if x == chars or y == chars:
                    continue
                else:
                    count_num = count_num + 1
            ans.append(count_num)
        answer = Counter(ans).most_common()
        last_answer = None
        for taple in answer:
            if last_answer == None:
                last_answer = taple
            elif taple[1] == last_answer[1]:
                if taple[0] >= last_answer[0]:
                    last_answer = taple
                else:
                    continue
            else:
                break
        return last_answer[0]

        
lst = []
for x in range(int(input())):
    lst.append(input())

test = Counters(lst)

print(test.count_x('(', ')'))