Teacher Li's reward method for batch assignments: 5 "A"s can be exchanged for 1 "★", 3 "★" can be exchanged for 1 "☺". Xiao Ming has got 2 "☺", this is how much he used. In exchange for an "A".
李老师批作业奖励办法：5个"A"可以换1颗"★"，3颗"★"可以换1个"☺"．小明已经得到了2个"☺"，这是他用多少．个"A"换来的．
<gadget id="calculator">3 * 2 * 5</gadget>
<output>30</output>

<result>30</result>