turtle climbs 1 meter north, then 2 meters east, then 3 meters south, 4 meters west, and finally 2 meters north, what is the distance between the turtle and the starting point?
一只乌龟向北爬1米，然后向东爬2米，再向南爬3米，向西爬4米，最后向北爬2米，此时乌龟与出发点相距多少米
<result>2</result>