Line up to do exercises, Xiaoming is the 4th person in the row from the front, and Xiaoming is the 6th person in the row from the back. How many people are there in this row?
排队做操，从前面数小明排第4个，从后面数小明排第6个，这一排一共有多少人．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<result>9</result>