Xiao Li marked the pages of "Animal Paradise". Every 3 pages of text in the book are a page of illustrations. After marking this book, he wrote a total of 216 numbers. Find out how many pages there are in this book.
小李给一本《动物乐园》标页码，书中每隔3页文字就是一页插图，标完这本书他共写了216个数字，求这本书一共有了多少页．
<result>107</result>