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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def add(self, val):
 """Add `val` to the current value if it's positive. Return without adding if `val` is not positive. :type val: int :param val: Value to add. """

        if not isinstance(val, six.integer_types):
            raise ValueError("CumulativePointLong only supports integer types")
        if val > 0:
            super(CumulativePointLong, self).add(val)