There are 5 classes in the sixth grade in a certain school. In the Hope Cup Mathematics Olympiad competition, at least how many people will win the prizes can guarantee that there must be 3 students in the same class.
某校六年级共有5个班，在希望杯奥数竞赛中，至少有多少人获奖，才能保证一定有3名学生是同班的．
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<result>11</result>