Class 61 originally planned to select (1/5) people to participate in the general cleaning, but two students took the initiative to participate temporarily, and the actual number of people participating in the general cleaning was (1/3) of the rest. How many students were originally planned to take part in the cleaning.
六一班原计划抽(1/5)的人参加大扫除，临时又有两个同学主动参加，实际参加大扫除的人数是其余人数的(1/3)．原计划抽多少个同学参加大扫除．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

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

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

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">2 / (1/20)</gadget>
<output>40</output>

<gadget id="calculator">40 * (1/5)</gadget>
<output>8</output>

<result>8</result>