There is a balance with a weight of 2 grams, 4 grams, 8 grams, and 10 grams. How many different weights can be weighed on the balance with these 4 weights?
有一架天平有2克、4克、8克、10克的砝码各一个，用这4个砝码在天平上一共可称多少种不同的重量．
<gadget id="calculator">4 + 4 + 3 + 1</gadget>
<output>12</output>

<result>12</result>