A taxpayer claimed $6,000 in state taxes (from the state boxes on the Forms W-2 they possessed), $5,000 in real estate taxes, and $7,000 in mortgage interest on their Schedule A. They also had $6,000 in medical expenses they could claim there. The IRS audits their return and the taxpayer is able to produce their W-2, their Form 1098, but none of the receipts for medical expenses paid. What is the actual amount of their allowable itemized deduction?