Among three consecutive natural numbers, the second number is twice the first number, and the third number is three times the first number, what is the sum of these three natural numbers?
三个连续自然数中，第二个数是第一个数的2倍，第三个数是第一个数的3倍，这三个自然数之和为多少．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

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

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">3 * 1</gadget>
<output>3</output>

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

<result>6</result>