If (2/9)＜(1/(□))＜(2/3), how many natural numbers can be filled in □.
如果(2/9)＜(1/(□))＜(2/3)，那么在□中可填的自然数有多少个．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / (1/3)</gadget>
<output>3</output>

<result>3</result>