Distribute 280 cards to several students, and everyone must get one, but no more than 10 cards. Try to explain: at least 6 students get the same number of cards.
把280张卡片分给若干名同学，每人都要分到，但都不能超过10张．试说明：至少有6名同学得到的卡片数同样多．
<result>6</result>