For three natural numbers, their least common multiple is 24, and their greatest common divisor is 3. What is the largest sum of these three natural numbers?
三个自然数，它们的最小公倍数是24，最大公因数是3，这三个自然数的和最大是多少．
<gadget id="calculator">3 + 12 + 24</gadget>
<output>39</output>

<result>39</result>