The 5th grade students in a certain school have subscribed to at least two publications in "Youth Science and Technology News", "Little Friends", "Story Club", "Juvenile Science", and "Youth Literature and Art". So how many students should there be at least in this grade to ensure that at least 10 of them order exactly the same newspapers and magazines.
某校5年级的同学，每人都订阅了《青少年科技报》、《小朋友》、《故事会》、《少年科学》、《少年文艺》中的至少2种刊物．那么这个年级至少要有多少名学生，才能保证他们中至少有10个人订的报刊杂志完全相同．
<gadget id="calculator">10 + 10 + 5 + 1</gadget>
<output>26</output>

<gadget id="calculator">26 * 9</gadget>
<output>234</output>

<gadget id="calculator">234 + 1</gadget>
<output>235</output>

<result>235</result>