There are 150 students in the first grade and 170 students in the second grade in the No. 1 Primary School in Tieli City. How many disposable syringes are needed for the two grades to be vaccinated?
铁力市第一小学一年级有学生150名，二年级有170名学生，两个年级学生注射疫苗共需要多少个一次性注射器？
<gadget id="calculator">150 + 170</gadget>
<output>320</output>

<result>320</result>