The school held school celebration activities. According to statistics, 1089 people visited the school in the morning, 455 people left after the visit, and 267 people visited the school in the afternoon. How many people are visiting the school now?
学校举办校庆活动，据统计上午来校参观的人数是1089人，参观后有455人离开，下午又有267人到校参观，现在在校参观的有多少人？
<gadget id="calculator">1_089 - 455</gadget>
<output>634</output>

<gadget id="calculator">634 + 267</gadget>
<output>901</output>

<result>901</result>