8 children stand in a team to do exercises, the distance between every 2 children is 1 meter, what is the length of the team?
8个小朋友站成一队做操，每2个小朋友间距离为1米，这支队伍长多少米．
<gadget id="calculator">1 * 1</gadget>
<output>1</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<result>7</result>