48 students stood in a row facing the teacher. The teacher first asked everyone to press 1, 2, 3, ... from left to right to count in turn; Students who are in multiples of , take a step back, how many students are still standing in the front row now?
48名同学面向老师站成一行，老师先让大家从左至右按1，2，3，…依次报数；再让报数是3的倍数的同学向后退一步，接着又让报数是5的倍数的同学向后退一步，那么现在站在前一排的同学还有多少名？
<gadget id="calculator">50 - 16 - 9</gadget>
<output>25</output>

<gadget id="calculator">25 + 3</gadget>
<output>28</output>

<result>28</result>