21+23+25+...+143．
21+23+25+…+143．
<gadget id="calculator">21 + 143</gadget>
<output>164</output>

<gadget id="calculator">143 - 21</gadget>
<output>122</output>

<gadget id="calculator">122 / 2</gadget>
<output>61</output>

<gadget id="calculator">61 + 1</gadget>
<output>62</output>

<gadget id="calculator">62 / 2</gadget>
<output>31</output>

<gadget id="calculator">164 * 31</gadget>
<output>5_084</output>

<result>5_084</result>