420 people visited the museum in the morning, 105 people left at noon, and 128 people came in the afternoon. How many people are there now?
博物馆上午有420人参观，中午离去105人，下午又来了128人，现在有多少人．
<gadget id="calculator">420 - 105</gadget>
<output>315</output>

<gadget id="calculator">315 + 128</gadget>
<output>443</output>

<result>443</result>