Xiao Ming has 800 meters from home to school. After walking halfway, Xiao Ming found that he did not bring a pencil case and ran home to get it. Then he rushed to school. How far did Xiao Ming walk in total?
小明从家到学校有800米，小明走了一半之后发现没有带文具盒又跑回家拿，然后赶到学校，请问小明一共走了多少路？
<gadget id="calculator">800 / 2</gadget>
<output>400</output>

<gadget id="calculator">400 * 2</gadget>
<output>800</output>

<gadget id="calculator">800 + 800</gadget>
<output>1_600</output>

<result>1_600</result>