Yucai Primary School has 215 students in the third grade, 21 fewer students in the second grade than the third grade, and 19 fewer students in the first grade than the second grade. How many students are there in first grade?
育才小学三年级有学生215人，二年级学生比三年级少21人，一年级又比二年级少19人．一年级有学生多少人？
<gadget id="calculator">215 - 21 - 19</gadget>
<output>175</output>

<result>175</result>