There are 60 trees in the campus, of which poplars account for (1/3), willows account for (1/4), pagoda trees account for (1/5), and the rest are cherry trees. How many cherry trees are there?
校园里一共有60棵树，其中杨树占(1/3)，柳树占(1/4)，槐树占(1/5)，其余的是樱花树，樱花树有多少颗？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/3) - (1/4) - (1/5)</gadget>
<output>13/60 = around 0.216667</output>

<gadget id="calculator">60 * (13/60)</gadget>
<output>13</output>

<result>13</result>