One afternoon, Teacher Zhang counted the activities of the students in Class 1, Grade 4 in the third class: Half of the students were studying mathematics, 1/4 were studying music, 1/7 were studying foreign languages, and the remaining 6 students were studying mathematics. Students are playing football on the playground. Then how many students are there in Class 1, Grade 4?
某天下午，张老师统计了四年级1班同学第三节课的活动情况：其中，一半学生在学数学，四分之一的学生在学音乐，七分之一的学生在读外语，还剩下6名学生正在操场踢足球．则四年级1班共有学生多少人．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/2) - (1/4) - (1/7)</gadget>
<output>3/28 = around 0.107143</output>

<gadget id="calculator">6 / (3/28)</gadget>
<output>56</output>

<result>56</result>