Children from class 2 and 1 lined up in a rectangular team to participate in the gymnastics performance. Hong Hong ranks 6th when viewed from the left, 2nd when viewed from the right, 4th when viewed from the front, and 3rd when viewed from the back. How many children are there in Class 2?
二1班小朋友排成长方形队伍参加体操表演．红红左看是第6名，右看是第2名，前看是第4名，后看是第3名．二1班共有多少小朋友．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<result>42</result>