user: Question: How many electorates are there with Hedmark as a constituency?
Columns: ['Constituency', 'Electorate', 's Spoilt vote', 'Total poll (%)', 'For (%)', 'Against (%)']
Types: ['text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['Østfold', 152837.0, 392.0, '121,498 (80)', '58,931 (49)', '62,567 (51)']
SQL:

assistant: SELECT COUNT("Electorate") FROM "Table" WHERE "Constituency" = 'Hedmark';