AB is two composite numbers with two digits, their least common multiple is 210, what is the minimum sum of A and B?
AB是两个合数，且都是两位数，它们的最小公倍数是210，A与B的和最小是多少．
<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">14 + 15</gadget>
<output>29</output>

<result>29</result>