In the performance square of the sports festival, Xiao Li's position is the 7th from the front and the 10th from the back. The number from the left is the 4th, and the number from the right is the 6th. How many people are there in this square?
体育节表演方阵中，小丽所站的位置从前面数是第7个，从后面数是第10个．从左面数是第4个，从右面数是第6个，这个方阵共有多少人？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">7 + 9</gadget>
<output>16</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

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

<gadget id="calculator">16 * 9</gadget>
<output>144</output>

<result>144</result>