A little black sheep is in the team of little white sheep, the little black sheep is the 7th from the front, and the 4th from the back. How many lambs are there in this team?
一只小黑羊排在小白羊队伍里，从前面数小黑羊是第7只，从后面数小黑羊是第4只．这队小羊一共有多少只？
<gadget id="calculator">6 + 3 + 1</gadget>
<output>10</output>

<result>10</result>