The students rehearse group gymnastics and line up in a square formation. The solid square in the middle is for female students, the outer three floors are for male students, and the outermost two floors are for female students. It is known that there are 108 male students in the square. How many female students are there?
同学们排练团体操，排成一个方阵．中间的实心方阵是女同学，外面3层是男同学，最外圈2层又是女同学，已知方阵中男同学是108人．女同学是多少人？
<gadget id="calculator">108 / 4 / 3</gadget>
<output>9</output>

<gadget id="calculator">9 + 3</gadget>
<output>12</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">12 + 4</gadget>
<output>16</output>

<gadget id="calculator">16 - 2</gadget>
<output>14</output>

<gadget id="calculator">14 * 2 * 4</gadget>
<output>112</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">112 + 36</gadget>
<output>148</output>

<result>148</result>