There is a balance and 1 gram, 2 gram, and 5 gram weights each. How many different weights can be weighed at one time? Some problems, (the weight can be placed in the left and right trays of the balance)
有一个天平和1克、2克、5克砝码各1个，一次共能称出多少种不同的重量．出题目的些，(砝码可任意放在天平左右托盘内)
<gadget id="calculator">1 + 2 + 5</gadget>
<output>8</output>

<result>8</result>