12 children stand in a row to do morning exercises, every two adjacent children are separated by 1 meter, how long is the team doing exercises?
12位小朋友站成一列做早操，每相邻2个小朋友间隔1米，做操的队伍长多少米．
<gadget id="calculator">1 * 1</gadget>
<output>1</output>

<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<result>11</result>