Students in a class of experimental elementary school do radio exercises. The sports committee forms a team in front. The other students line up in a row of 12 or 15 students.
实验小学一个班的同学做广播操，体育委员在前面整队，其他学生排成每行12人或每行15人都正好是整行，这个班至少有学生多少人．
<gadget id="calculator">3 * 2 * 2 * 5</gadget>
<output>60</output>

<gadget id="calculator">60 + 1</gadget>
<output>61</output>

<result>61</result>