In a rectangle with a length of 15 cm and a width of 8 cm, what is the perimeter of the remaining rectangle after cutting off the largest square?
在一个长15cm、宽8cm的长方形中，剪掉一个最大的正方形后，剩下的长方形周长是多少．
<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>