There are three weights: 1 gram, 4 grams, 6 grams, how many different weights can you weigh at one time? Can you please list them one by one with formulas?
有三个砝码：1克、4克、6克，你一次可以称出多少种不同的重量？请用算式一一列出来吗？
<gadget id="calculator">3 + 3 + 1</gadget>
<output>7</output>

<result>7</result>