Question: what is the number of total presidential electoral votes
[{'answer': '538', 'provenance': [{'wikipedia_id': '85533', 'title': 'United States Electoral College', 'start_paragraph_id': 1, 'start_character': 242, 'end_paragraph_id': 1, 'end_character': 245, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '85533', 'title': 'United States Electoral College', 'start_paragraph_id': 15, 'start_character': 74, 'end_paragraph_id': 15, 'end_character': 1017, 'bleu_score': 0.530937413143602, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1457333874185788985}, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '85533', 'title': 'United States Electoral College', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The Electoral College consists of 538 electors, and an absolute majority of 270 electoral votes is required to win an election.', '538', '538']}}]}, {'provenance': [{'wikipedia_id': '2390318', 'title': 'List of United States presidential elections by Electoral College margin', 'section': 'Section::::Definition of the margin.:Informal definition.\n', 'start_paragraph_id': 4, 'end_paragraph_id': 4, 'meta': {'evidence_span': ['would be the difference between the number of electoral votes won by the candidate with at least a majority of electoral votes (currently 270 of 538)', '538', '538']}}]}, {'provenance': [{'wikipedia_id': '85533', 'title': 'United States Electoral College', 'section': 'Section::::Modern mechanics.:Electors.:Apportionment.\n', 'start_paragraph_id': 59, 'end_paragraph_id': 59, 'meta': {'evidence_span': ['there are 538 electors', '538', '538']}}]}, {'provenance': [{'wikipedia_id': '24113', 'title': 'President of the United States', 'section': 'Section::::Selection process.:Election.\n', 'start_paragraph_id': 62, 'end_paragraph_id': 62, 'meta': {'evidence_span': ['If a candidate has received an absolute majority of electoral votes for president (currently 270 of 538', '538', '538']}}]}]