In a mathematics test, there are 10 multiple-choice questions. The scoring method is: 4 points for a correct answer, 1 point deducted for a wrong answer, and 0 points for no answer. It is known that at least 4 students took the test The score is the same. So, at least how many students take the test.
在一次数学考试中，有10道选择题，评分办法是：答对一题得4分，答错一题倒扣1分，不答得0分，已知参加考试的学生中，至少有4人得分相同．那么，参加考试的学生至少有多少人．
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">1 * 10</gadget>
<output>10</output>

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

<gadget id="calculator">40 + 10 + (-5)</gadget>
<output>45</output>

<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<gadget id="calculator">135 + 1</gadget>
<output>136</output>

<result>136</result>