There are 6 multiple-choice questions in one exam, and the scoring rules are as follows: 6 points are given to each person first, and 4 points are added for each correct answer. 1 point will be deducted for a wrong answer, and 0 points will be awarded for no answer. There are currently 51 students taking the exam, then, at least how many people have the same score.
一次考试共有6道选择题，评分规则如下：每人先给6分，答对一题加4分．答错一题减1分，不答得0分．现有51名同学参加考试，那么，至少有多少人得分相同．
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">1 - 6</gadget>
<output>-5</output>

<gadget id="calculator">51 - 1</gadget>
<output>50</output>

<gadget id="calculator">24 + 6 + (-5) + 50</gadget>
<output>75</output>

<gadget id="calculator">24 + 6 + (-5)</gadget>
<output>25</output>

<gadget id="calculator">75 / 25</gadget>
<output>3</output>

<result>3</result>