There is a balance and a weight of 1g, 2g, and 5g each. How many objects of different weights can be weighed with these 3 weights (only one side of the weight is allowed to be placed)?
有一架天平和1g、2g、5g的砝码各1个，用这3个砝码(只许一边放砝码)能称出几种不同重量的物体？
<gadget id="calculator">3 + 3 + 1</gadget>
<output>7</output>

<result>7</result>