user: Question: Team of elgin city, and a Highest smaller than 537 had what total number of average?
Columns: ['Team', 'Stadium', 'Capacity', 'Highest', 'Lowest', 'Average']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['Annan Athletic', 'Galabank Stadium', 3500.0, 1343.0, 422.0, 734.0]
SQL:

assistant: SELECT SUM("Average") FROM "Table" WHERE "Team" = 'elgin city' AND "Highest" < 537.0;