Mr. Zhang has to walk 1,800 meters from home to school. After he walked 400 meters, he went home to pick up the pencil case. How many meters did he walk from home to school?
张老师从家到学校要走1800米，他走了400米后又回家取笔盒，这样他从家到学校共走了多少米？
<gadget id="calculator">400 + 400 + 1_800</gadget>
<output>2_600</output>

<result>2_600</result>