22 children are lined up in a column, and every two children are separated by 1 meter. What is the total length of the line?
22个小朋友排成一路纵队，每两个小朋友间隔1米，排成的队伍全长多少米．
<gadget id="calculator">22 - 1</gadget>
<output>21</output>

<gadget id="calculator">21 * 1</gadget>
<output>21</output>

<result>21</result>