How many pieces can be divided into at most by drawing 10 straight lines on a circular piece of paper?
在一张圆形纸片中画10条直线最多能把它分成多少块．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

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

<gadget id="calculator">11 * 5</gadget>
<output>55</output>

<gadget id="calculator">1 + 55</gadget>
<output>56</output>

<result>56</result>