The thickness of a 1 cent coin is about 1 millimeter. What is the total thickness of 30 such coins stacked together in centimeters?
1分硬币的厚度大约是1毫米，30枚这样的硬币垒在一起的总厚度大约是多少厘米．
<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<result>3</result>