user: Question: Name the total number of population hervey bay with population woocoo less than 640 and population of maryborough less than 19257
Columns: ['Year', 'Population (Region total)', 'Population (Maryborough)', 'Population (Hervey Bay)', 'Population (Woocoo)', 'Population (Tiaro)']
Types: ['real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1933.0, 22170.0, 11415.0, 6835.0, 777.0, 3143.0]
SQL:

assistant: SELECT SUM("Population (Hervey Bay)") FROM "Table" WHERE "Population (Woocoo)" < 640.0 AND "Population (Maryborough)" < 19257.0;