Students in a certain class take an exam, and their grades are divided into four grades: excellent, good, pass, and fail. It is known that (1/2) of the students in this class are excellent, (1/3) are good, and (1/7) are passing. If the number of students in the class does not exceed 60, how many students failed in the class.
某班学生参加一次考试，成绩分优、良、及格、不及格四等．已知该班有(1/2)的学生得优，有(1/3)的学生得良，有(1/7)的学生得及格．如果该班学生人数不超过60人，则该班不及格的学生有多少人．
<gadget id="calculator">2 * 3 * 7</gadget>
<output>42</output>

<gadget id="calculator">1 / 42</gadget>
<output>1/42 = around 0.02381</output>

<gadget id="calculator">42 * (1/42)</gadget>
<output>1</output>

<result>1</result>