In the formula (1/(live))+(1/(movement))+(1/(middle))+(1/(heart))=1, "live" "movement" "middle" "heart" means different The four non-zero natural numbers, when "heart" = 18, activity + movement + middle = how much.
在算式(1/(活))+(1/(动))+(1/(中))+(1/(心))=1，"活""动""中""心"表示不同的四个非零自然数，当"心"=18时，活+动+中=多少．
<gadget id="calculator">2 + 3 + 9</gadget>
<output>14</output>

<result>14</result>