bus runs from a point to a destination, and there are 13 stops on the way. If the bus starts from the starting point, except the destination, there will be exactly one passenger from this stop to every subsequent stop. station, how many seats does the bus have at least in order for each passenger to have a seat?
某公共汽车从点开往终点，中途共有13个停车站，如果这辆公共汽车从起点站开始，除终点在外，每一站上下的乘客中正好有一位乘客从这一站到以后的每一站，那么为了使每位乘客有座位，这辆公共汽车至少有多少个座位？
<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<result>42</result>