Students are standing in a rectangular field. Chris is $7$\textsuperscript{th} in line counting from the front, and $4$\textsuperscript{th} in line counting from the back. He is also $3$\textsuperscript{rd}~in line counting from the left, and $7$\textsuperscript{th}~in line counting from the right. There are~\uline{~~~~~~~~~~}~students in total in the rectangular field. 
Overseas Competition->Knowledge Point->Word Problem Modules->Problems Involving Queuing