def scoreOfParentheses(s):
    """
    :type s: str
    :rtype: int
    """
    score = left = right = 0

    for x in s:
        if x == "(":
            left += 1
            score += 1
        elif x == ")":
            right += 1
            score += 1
    if left > right:
        score = 2 * left
    else:
        score /= 2
    return score

print(scoreOfParentheses("()"))