There were 536 bags of cement on the construction site, 143 bags were used on the first day, and 157 bags were used on the second day. How many bags are left?
工地上有536袋水泥，第一天用了143袋，第二天用了157袋．还剩多少袋？
<gadget id="calculator">536 - 143 - 157</gadget>
<output>236</output>

<result>236</result>