Calculation: 1*1+2*2+3*3+...+200*200=how much.
计算：1*1+2*2+3*3+…+200*200=多少．
<gadget id="calculator">200 + 1</gadget>
<output>201</output>

<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<gadget id="calculator">400 + 1</gadget>
<output>401</output>

<gadget id="calculator">401 / 6</gadget>
<output>401/6 = around 66.833333</output>

<gadget id="calculator">200 * 201 * (401/6)</gadget>
<output>2_686_700</output>

<result>2_686_700</result>