There are 1 gram, 2 gram, and 3 gram weights, so several objects with different weights can be weighed on the balance. How many
现有1克、2克、3克的砝码各一个，那么在天平上能称出几种不同重量的物体．多少
<gadget id="calculator">1 - 1</gadget>
<output>0</output>

<gadget id="calculator">3 + 3 + 0</gadget>
<output>6</output>

<result>6</result>