For 2019, a taxpayer and spouse have $1,600 of nonbusiness capital gains, $1,000 of nonbusiness capital losses, $13,000 of interest income, $12,000 of itemized deductions (none of which are personal casualty and theft losses), $3,000 of business capital losses, and $1,000 of business capital gains. How much must they add back to taxable income to calculate the NOL?