The students watered 800 small trees, the first group watered 268 trees, and the second group watered 365 trees. How many young trees are left unwatered?
同学们给800棵小树浇水，一组浇了268棵，二组浇了365棵．还剩下多少棵小树没浇？
<gadget id="calculator">800 - 268 - 365</gadget>
<output>167</output>

<result>167</result>