In a mathematics competition, among the participating students, (1/7) got excellent, (1/3) got good, (1/2) got good, and the rest got poor. It is known that there are less than 50 students who participated in the competition. How many students are in ?
一次数学竞赛，结果参赛的学生中有(1/7)得优，(1/3)得良，(1/2)得中，其余得差，已知参加竞赛的学生不满50人，得差的学生的人数是几人？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/7) + (1/3) + (1/2)</gadget>
<output>41/42 = around 0.97619</output>

<gadget id="calculator">1 - (41/42)</gadget>
<output>1/42 = around 0.02381</output>

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

<result>1</result>