A piece of biscuit is cut 7 knives, how many pieces can be cut at most. (Cakes cannot overlap)
一张饼切7刀，最多能切成多少块．(饼不能重叠)
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">1 + 1 + 2 + 3</gadget>
<output>7</output>

<gadget id="calculator">7 * 8</gadget>
<output>56</output>

<gadget id="calculator">56 / 2</gadget>
<output>28</output>

<gadget id="calculator">1 + 28</gadget>
<output>29</output>

<result>29</result>