There are 12 male students queuing up, and one female student stands between every two male students. How many female students can stand in total?
有12个男同学排队，每两个男同学之间站1个女同学，一共可以站多少个女同学？
<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<result>11</result>