There are 45 students in a class, including 35 young pioneers. It is known that there are 28 boys in this class and 3 girls who are not Young Pioneers, so how many fewer female Young Pioneers than male Young Pioneers?
某班有45名同学，其中少先队员有35人．已知这个班有男生28人，不是少先队员的女生有3人，那么女少先队员比男少先队员少多少人？
<gadget id="calculator">45 - 35 - 3</gadget>
<output>7</output>

<gadget id="calculator">28 - 7</gadget>
<output>21</output>

<gadget id="calculator">21 - 17</gadget>
<output>4</output>

<result>4</result>