Question: how many ships does the united states navy have
[{'answer': '461'}, {'provenance': [{'wikipedia_id': '1432196', 'title': 'List of current ships of the United States Navy', 'start_paragraph_id': 1, 'start_character': 23, 'end_paragraph_id': 1, 'end_character': 825, 'bleu_score': 0.8484593189093821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4809098465356475042}, 'section': 'Section::::Abstract.'}]}]