def get_summary(html_text):
    """Returns the summary part of the raw html text string of the wikipedia article.

    :param html_text: The html content of an article.
    :type html_text: str
    :return: The summary of the input wikipedia article.
    :rtype: str
    """
    # The summary ends before the first h tag.
    end_summary_index = html_text.find('<h')
    summary = html_text[:end_summary_index]
    return summary