The product of three natural numbers is 240, and the sum of two smaller numbers is equal to the third number, so what is the sum of these three natural numbers.
三个自然数的乘积是240，其中两个较小数的和等于第三个数，那么这三个自然数的和是多少．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

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

<gadget id="calculator">4 + 6 + 4 + 6</gadget>
<output>20</output>

<result>20</result>