If a line segment is folded in half 4 times and then cut from the middle, how many line segments can be obtained in this way?
一条线段，如果对折4次以后，再从中间剪一刀，这样可以得到多少条线段．
<gadget id="calculator">2 ** 4</gadget>
<output>16</output>

<gadget id="calculator">16 + 1</gadget>
<output>17</output>

<result>17</result>