Hi. Here is a problem I found in my algebra book and I don't know how to solve it. Could you please help me?

Show that there exists a matrix $\displaystyle A \in M(n,n;R)$, such that $\displaystyle m_{ij} \in \{-1,0,1\}$ and $\displaystyle det M=1995$

My problem is that I don't know what I should do toprovethat thereexista certain matrix.