Xiao Jin participated in a group gymnastics competition. His position during the competition was the 8th from left to right, the 8th from right to left, the 5th from front to back, and the 16th from back to front How many people participated in this group gymnastics competition?
小金参加一团体操比赛，他在比赛时的位置从左往右数是第8个，从右往左数也是第8个，从前面往后面数是第5个，从后面往前面数是第16个，参加这个团体操比赛的一共有多少人？
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">5 + 15</gadget>
<output>20</output>

<gadget id="calculator">15 * 20</gadget>
<output>300</output>

<result>300</result>