The students are doing exercises, counting from front to back, Xiao Liu is ranked 6th, counting from back to front, she is ranked 16th, counting from left to right, she is ranked 4th, and counting from right to left, she is ranked 7th , How many people are there in this team?
同学们做操，从前往后数小刘排在第6，从后往前数她排在第16，从左往右数她排在第4行，从右往左数她排在第7行，这个队伍共有多少人？
<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">6 + 15</gadget>
<output>21</output>

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

<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">21 * 10</gadget>
<output>210</output>

<result>210</result>