Five consecutive natural numbers, the third of which is 2 less than the sum of one or two numbers (5/9), what is the third number?
五个连续自然数，其中第三个比一、一两个数的和的(5/9)少2，第三个数是多少？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">2 * (5/9)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">(10/9) + (5/9) + 2</gadget>
<output>11/3 = around 3.666667</output>

<gadget id="calculator">(5/9) - 1</gadget>
<output>-4/9 = around -0.444444</output>

<gadget id="calculator">(5/9) + (-4/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(11/3) / (1/9)</gadget>
<output>33</output>

<result>33</result>