Calculation: 4*5+5*6+6*7+...+25*26+26*27=how much.
计算：4*5+5*6+6*7+…+25*26+26*27=多少．
<gadget id="calculator">26 + 1</gadget>
<output>27</output>

<gadget id="calculator">2 * 26</gadget>
<output>52</output>

<gadget id="calculator">52 + 1</gadget>
<output>53</output>

<gadget id="calculator">53 / 6</gadget>
<output>53/6 = around 8.833333</output>

<gadget id="calculator">26 * 27 * (53/6)</gadget>
<output>6_201</output>

<gadget id="calculator">6_201 - 14</gadget>
<output>6_187</output>

<gadget id="calculator">4 + 26</gadget>
<output>30</output>

<gadget id="calculator">23 / 2</gadget>
<output>23/2 = around 11.5</output>

<gadget id="calculator">30 * (23/2)</gadget>
<output>345</output>

<gadget id="calculator">6_187 + 345</gadget>
<output>6_532</output>

<result>6_532</result>