user: Question: How many n are listed for Berbers from Siwa?
Columns: ['Region', 'Population', 'Country', 'Language', 'N', 'Total%', 'R1b1c (R-V88)', 'R1b1a2 (R-M269)', 'R1b1c* (R-V88*)', 'R1b1c4 (R-V69)']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['N Africa', 'Composite', 'Morocco', 'AA', 338.0, '0.0%', '0.3%', '0.6%', '0.3%', '0.0%']
SQL:

assistant: SELECT "N" FROM "Table" WHERE "Population" = 'Berbers from Siwa';