Samantha and Ashley form the MAS General Partnership. Samantha contributed $20,000 cash in exchange for her 50 percent partnership interest. During the first year of partnership operations, the partnership reported net taxable income of $10,000, Samantha withdrew $8,000 cash from the partnership, and the partnership took out an $18,000 loan on the last day of the year. Samantha's adjusted basis for her partnership interest at year end is?