+50 means 50m east of the starting point. If Xiao Li walks 200m east from the starting point and then 300m west, then what is Xiao Li's position at this time?
+50表示在起点的东边50m处．如果小李从起点先向东走200m后再向西走300m，那么小李这时的位置可以表示为多少．
<gadget id="calculator">300 - 200</gadget>
<output>100</output>

<result>100</result>