user: Question: What Avoirdupois value has a Russian of берковец?
Columns: ['Unit', 'Russian', 'Ratio', 'Metric value', 'Avoirdupois value']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['dolia', 'до́ля', '1/9216 = 1/96 2', '44.435 mg', '0.686 gr']
SQL:

assistant: SELECT "Avoirdupois value" FROM "Table" WHERE "Russian" = 'берковец';