MathDB

Students are in classroom with

n

rows. In each row there are

m

tables. It's given that

m,n \geq 3

. At each table there is exactly one student. We call neighbours of the student students sitting one place right, left to him, in front of him and behind him. Each student shook hands with his neighbours. In the end there were

252

handshakes. How many students were in the classroom?

Problem Statement