Auto Populate Column A when Data is entered anywhere in the rest of the row.

Hi,

Here is my example:


UniqID Server IP OS
1 Server1 1.1.1.1 Windows
2 Server2 1.1.1.2 Linux
3 Server3 1.1.1.10 Linux


Basically, Column A (uniqID) will be hidden from user, however when ever user enters any information in column B,C or D - I would like Column A , on the same row, to auto increment by 1.