Add 5 to a certain number, multiply by 5, subtract 5, divide by 5, the result is still equal to 5, what is this number?
某数加上5，乘5，减去5，除以5，结果还等于5，这个数是多少．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 + 5</gadget>
<output>30</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<result>1</result>