<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def count(self, count):
 """ Sets the count of this PaginatedDatasetResults. :param count: The count of this PaginatedDatasetResults. :type: int """

        if count is None:
            raise ValueError("Invalid value for `count`, must not be `None`")
        if count is not None and count < 0:
            raise ValueError("Invalid value for `count`, must be a value greater than or equal to `0`")

        self._count = count