What is the result of subtracting the quotient of 40 divided by 40 from 40 and multiplying the difference by 40?
40减去40除以40的商，所得的差再乘以40，结果是多少．
<gadget id="calculator">40 / 40</gadget>
<output>1</output>

<gadget id="calculator">40 - 1</gadget>
<output>39</output>

<gadget id="calculator">39 * 40</gadget>
<output>1_560</output>

<result>1_560</result>