It is known that a*b=132, b*c=156, a*c=143 (a, b, and c are all natural numbers), then a+b+c=how much.
已知a*b=132，b*c=156，a*c=143(a、b、c均为自然数)，则a+b+c=多少．
<gadget id="calculator">11 + 12 + 13</gadget>
<output>36</output>

<result>36</result>