There are 4 weights of 1 gram, 2 gram, 5 gram and 10 gram, how many objects of different masses can be weighed in total? (Weights are only allowed on one side of the balance)
有1克、2克、5克、10克4个砝码，一共可以称出多少种不同质量的物体？(砝码只允许放在天平一侧)
<gadget id="calculator">6 + 4 + 4 + 1</gadget>
<output>15</output>

<result>15</result>