What is the reciprocal of the smallest prime number plus the smallest composite number, multiplied by the smallest natural number, plus the counting unit of the natural number, divided by 0.5.
最小的质数加上最小的合数，乘以最小的自然数，再加上自然数的计数单位，除以0.5的倒数为多少．
<gadget id="calculator">2 + 4</gadget>
<output>6</output>

<gadget id="calculator">6 * 1</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>