In the subtraction formula, the 3 in the subtrahend's place is mistakenly written as 5, and the resulting difference is 254. What is the correct difference?
在减法算式中，错把减数个位上的3写成了5，结果得到的差是254．正确的差是多少？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">254 + 2</gadget>
<output>256</output>

<result>256</result>