If the length of a rectangle is increased by 4 centimeters and its width is increased by 1 centimeter, what is the increase in its perimeter?
一个长方形的长增加了4厘米，宽增加了1厘米，它的周长增加了多少厘米
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>