Question: what is the lowest round ever played at the masters
[{'answer': '270 ( − 18 )'}, {'provenance': [{'wikipedia_id': '157211', 'title': 'Masters Tournament', 'start_paragraph_id': 117, 'start_character': 0, 'end_paragraph_id': 117, 'end_character': 477, 'bleu_score': 0.86874746358549, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15160212145164829673}, 'section': 'Section::::Records.\n'}]}]