A, B, and C bought 9 loaves of bread and shared them equally. A paid for 5 loaves, B paid for 4 loaves, and C did not bring any money. After calculation, C should pay 4.5 yuan. How much should A get back?
甲乙丙三人共买了9个面包平均分着吃，甲付了5个面包的钱，乙付了4个面包的钱，丙没有带钱，经计算丙应付4.5元．甲应收回多少钱？
<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">4.5 / 3</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 * 2</gadget>
<output>3</output>

<result>3</result>