There are 3 first, second and third prizes in a certain competition. The first prize is three times the second prize, and the second prize is twice the third prize. If the first prize is 4,500 yuan, then the competition has a total of How much is the bonus.
某比赛设一、二、三等奖各3名，一等奖奖金是二等的3倍，二等奖奖金是三等的2倍，如果一等奖奖金为4500元，那么这次比赛共需奖金多少元．
<gadget id="calculator">4_500 / 3</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 / 2</gadget>
<output>750</output>

<gadget id="calculator">4_500 + 1_500 + 750</gadget>
<output>6_750</output>

<gadget id="calculator">6_750 * 3</gadget>
<output>20_250</output>

<result>20_250</result>