It is known that X○Y=2*X+Y, so how much is 5○4+6=.
已知X○Y=2*X+Y，那么5○4+6=多少．
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">10 + 4 + 6</gadget>
<output>20</output>

<result>20</result>