For 2018, Brian and Erin have $1,800 of nonbusiness capital gains, $4,000 of nonbusiness capital losses, $2,700 of interest income, $18,200 of itemized deductions (none of which are personal casualty and theft losses), $6,500 of business capital losses, and $2,600 of business capital gains. They file a joint tax return. Based on these transactions, to arrive at the NOL, Brian and Erin's taxable income must be adjusted by: