There is a flower bed with a radius of 4 meters in the Children's Palace, and there is a path of 1 meter around the flower bed. What is the area of this path in square meters?
少年宫有一个半径4米的花坛，环绕花坛有一条1米的小路，这条小路的面积是多少平方米？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">25 - 16</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>