When Xiaofang went from home to school, she walked to the square and remembered that she forgot her book at home. She returned home to pick up the book and rushed to school. It was known that the distance from home to the square was 850 meters, and the distance from the square to school was 800 meters. How many meters did you walk in total?
小芳从家去学校时，走到广场才想起书忘在家里了，返回家取书再赶到学校，已知从家去广场的路程为850米，从广场到学校的路程800米，她一共走了多少米？
<gadget id="calculator">850 * 2</gadget>
<output>1_700</output>

<gadget id="calculator">1_700 + 800</gadget>
<output>2_500</output>

<result>2_500</result>