Example 2. There are 67 students in the classroom, boys go out (1/5), girls go out 5 people, and the rest of the female students are 1 less than the male students. How many male students are there in the classroom?
例2．教室里有67名同学，男生出去(1/5)，女生出去5个人，剩下的女同学比男同学少1人．教室里原有男同学多少人？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">67 - 4</gadget>
<output>63</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) + 1</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">63 / (9/5)</gadget>
<output>35</output>

<result>35</result>