There are three classes A, B, and C in the third grade. Class A has 4 more girls than Class B, and Class B has 1 more girl than Class C. If the first group of students in Class A are transferred to Class B, and Class B If the first group of students in class C are transferred to class C, and the first group of students in class C are transferred to class A, then the number of girls in the three classes is exactly the same. It is known that there are 2 girls in the first group of class C, how many girls are there in the first group of class A?
三年级有甲、乙、丙三个班，甲班比乙班多4名女生，乙班比丙班多1名女生，如果将甲班的第一组同学调入乙班，同时将乙班的第一组同学调入丙班，将丙班的第一组同学调入甲班，则三个班的女生人数恰好相同．已知丙班第一组有2名女生，那么甲班第一组有多少名女生．
<gadget id="calculator">1 - 4</gadget>
<output>-3</output>

<gadget id="calculator">4 + 1 + (-3)</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<result>5</result>