How many parts can the plane be divided into by 5 straight lines and a circle?
平面上5条直线和一个圆，最多能把平面分成多少个部分？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

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

<gadget id="calculator">16 + 10</gadget>
<output>26</output>

<result>26</result>