A balance has a weight of 5 grams, 10 grams and 25 grams each. How many different weights can be directly weighed on the balance with these three weights (the weights are only placed on one side of the balance)
一架天平有5克、10克和25克砝码各一个，用这三种砝码可以在天平上直接称出多少种不同的重量(砝码只放在天平的一边)
<gadget id="calculator">3 + 3 + 1</gadget>
<output>7</output>

<result>7</result>