Please calculate how much 1+2+3+...+173+174=.
请计算1+2+3+…+173+174=多少．
<gadget id="calculator">1 + 174</gadget>
<output>175</output>

<gadget id="calculator">174 / 2</gadget>
<output>87</output>

<gadget id="calculator">175 * 87</gadget>
<output>15_225</output>

<result>15_225</result>