How many parts can a circle be divided into at most by 10 line segments?
用10条线段最多能把一个圆分成多少份．
<gadget id="calculator">1 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10</gadget>
<output>56</output>

<result>56</result>