Starfish Supermarket bought 600 items, sold 236 items on the first day, and sold 75 more items on the second day than on the first day. How many items are still not sold?
海星超市进了600件商品，第一天卖出236件，第二天比第一天多卖出75件．还有多少商品没有卖掉？
<gadget id="calculator">236 + 75</gadget>
<output>311</output>

<gadget id="calculator">600 - 236 - 311</gadget>
<output>53</output>

<result>53</result>