s = input() l = 0 #左括号数量 r = 0 #右括号数量 m = 0 #最大深度 for i in s: if i == '(': l = (l-r+1) r = 0 else: if l > m: m = l r += 1 print(m)
s = input() l = 0 #左括号数量 r = 0 #右括号数量 m = 0 #最大深度 for i in s: if i == '(': l = (l-r+1) r = 0 else: if l > m: m = l r += 1 print(m)