Question: how many movies are there in the pirates of the carribean series
[{'answer': '5', 'provenance': [{'wikipedia_id': '8770750', 'title': 'Pirates of the Caribbean (film series)', 'start_paragraph_id': 2, 'start_character': 117, 'end_paragraph_id': 2, 'end_character': 118, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]