A, B, and C go to a bookstore to buy books, B buys 1 less book than A (2/3), and C buys 2 more books than A (1/2), then How many books did the three of them buy at least together?
甲、乙、丙三人去书店买书，乙买的书比甲买的书的(2/3)少1本，丙买的书比甲买的书的(1/2)多2本，则三人合计最少买了多少本书．
<gadget id="calculator">13 + 1</gadget>
<output>14</output>

<result>14</result>