Given that the greatest common factor of two positive integers is 4 and the least common multiple is 24, what is the maximum value of the sum of these two numbers?
已知两个正整数的最大公因数是4，最小公倍数是24，那么这两个数和的最大值是多少．
<gadget id="calculator">4 + 24</gadget>
<output>28</output>

<result>28</result>