There are 126 students in the first grade, 157 students in the second grade, and 95 students in the third grade. Please ask a math problem and then answer it.
学校一年级有126人，二年级有157人，三年级有95人，请你提出一个数学问题，再解答．
<gadget id="calculator">126 + 157 + 95</gadget>
<output>378</output>

<result>378</result>