Subtract 145 from 2007, add 138, subtract 145, add 138... until it is equal to 0, how many times did you subtract in total?
从2007里减去145、加上138，减去145、加上138…直到等于0，一共做了多少次减法．
<gadget id="calculator">2_007 - 145</gadget>
<output>1_862</output>

<gadget id="calculator">1_862 / 7</gadget>
<output>266</output>

<gadget id="calculator">266 + 1</gadget>
<output>267</output>

<result>267</result>