calculate. 1+2+3+4...98+99+100.
计算．1+2+3+4…98+99+100．
<gadget id="calculator">1 + 100</gadget>
<output>101</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">101 * 50</gadget>
<output>5_050</output>

<result>5_050</result>