Walter, who is single, owns a personal residence in the city. He also owns a cabin near a ski resort in the mountains. He uses the cabin as a vacation home. In August, Walter borrowed $60,000 on a home equity loan and used the proceeds to reduce credit card obligations and other debt. This year, he paid the following amounts of interest.

On his personal residence

$16,000

On the cabin

7,000

On the home equity loan

2,500

On credit card obligations

1,500

On purchase of personal use SUV

1,350

What amount, if any, must Walter recognize as an AMT adjustment?