road is 400m long, Xiaoguang and his puppy start from the starting point of the road at the same time at a uniform speed. When Xiaoguang walks to (1/4) of this road, the puppy has reached the end of the road. Then the puppy goes back and walks towards Xiaoguang, runs to the finish line after meeting Xiaoguang, and walks towards Xiaoguang after reaching the finish line...until Xiaoguang reaches the finish line. How many m did the puppy run in total from the start?
一条马路长400m，小光和他的小狗分别以均匀的速度同时从马路的起点出发．当小光走到这条马路的(1/4)时候，小狗已经到达马路的终点．然后小狗返回与小光相向而行，遇到小光以后再跑向终点，达到终点以后再与小光相向而行…直到小光达到终点．小狗从出发开始，一共跑了多少m？
<gadget id="calculator">400 * 4</gadget>
<output>1_600</output>

<result>1_600</result>