Jamel and Jennifer have been married 30 years and have filed a joint return every year of their marriage. Their three daughters, Jade, Lindsay, and Abbi, are ages 12, 17, and 22 respectively and all live at home. None of the daughters provide more than half of her own support. Abbi is a full-time student at a local university and does not have any gross income. How many of the daughters qualify as dependents of Jamel and Jennifer?