class InputParser:
    def __init__(self, data):
        self._data = data
        self._pos = -1
        self._next = None

    def lex(self):
        if self._next != None:
            result = self._next
            self._next = None
            return result
        self._pos = self._pos + 1
        c = self._data[self._pos]
        if c == '(' or c == ')' or c == None:
            return c
        d = '0123456789'
        v = d.find(c)
        while True:
            i = d.find(self._data[self._pos + 1])
            if i == -1:
                break
            v = v * 10 + i
            self._pos = self._pos + 1
        return v

    def lookahead(self):
        if self._next == None:
            self._next = self.lex()
        return self._next

result = 0
def read_and_sum(parser):
    global result
    if parser.lex() != '(':
        raise SyntaxError('Expected: "("')
    l = parser.lookahead()
    if l == '(':
        left = read_and_sum(parser)
        l = parser.lex()
    else:
        parser.lex()
        left = None
    if type(l) is int:
        key = l
    else:
        raise SyntaxError('Expected: number')
    l = parser.lookahead()
    if l == ')':
        right = None
    else:
        right = read_and_sum(parser)
    if parser.lex() != ')':
        raise SyntaxError('Expected: ")"')
    if (left == None or left < key) and (right == None or right > key):
        result = result + 1
    return key

parser = InputParser(input())
read_and_sum(parser)
print(result)