There are 562 tourists in the park in the morning, 256 people leave at noon, and 138 people come in the afternoon. How many people are there in the park at this time?
公园上午有游客562人，中午离开256人，下午又来了138人，这时公园里有多少人？
<gadget id="calculator">562 - 256</gadget>
<output>306</output>

<gadget id="calculator">306 + 138</gadget>
<output>444</output>

<result>444</result>