Xiao Ming has a stack of books, and after distributing them to 5, 6, and 7 people on average, there are 3 books left. How many books are there in this stack?
小明有一摞书，分别平均分给5人、6人、7人后，都剩下3本，这摞书至少有多少本．
<gadget id="calculator">5 * 6 * 7</gadget>
<output>210</output>

<gadget id="calculator">210 + 3</gadget>
<output>213</output>

<result>213</result>