There are 1 gram, 2 gram, and 5 gram weights, how many objects of different masses can be weighed?
有1克、2克、5克的砝码各一个，可以称量多少种不同质量的物体．
<gadget id="calculator">3 + 3 + 1 + 1</gadget>
<output>8</output>

<result>8</result>