#!/bin/python3

import sys
from pprint import pprint

input_f = sys.argv[1]

result = 0

with open(input_f) as file:
    for line in file:
        for idx,i in enumerate(line):
            if i == '(':
                result += 1
            if i == ')':
                result -= 1
            if result == -1:
                print(idx+1)
                break
print(result)