Grilled kebabs, the first side takes 2 minutes, and the second side takes 1 minute. Dad uses a grill, and only 2 skewers can be placed at a time. If you want to roast 3 skewers, how many minutes will it take at least?
烤羊肉串，第一面要2分钟，第二面要1分钟，爸爸用烧烤的架子，一次只能放2串羊肉串，如果要烤3串羊肉串，至少需要多少分钟
<gadget id="calculator">2 + 1 + 1 + 1</gadget>
<output>5</output>

<result>5</result>