On a straight runway of 1000 meters, one obstacle is placed at a distance of 50 meters, so how many obstacles should be placed in total?
在1000米的直线跑道上，间距50米放一个障碍物，那么一共要放多少个障碍物？
<gadget id="calculator">1_000 / 50</gadget>
<output>20</output>

<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<result>21</result>