A, B, and C are three different natural numbers, and satisfy (1/(A))+(1/(B))+(1/(C))=(4/5), find A+B +C．
A、B、C是三个互不相同的自然数，并且满足(1/(A))+(1/(B))+(1/(C))=(4/5)，求A+B+C．
<gadget id="calculator">10 + 5 + 2</gadget>
<output>17</output>

<result>17</result>