type data in one cell, it also appears in another

Hello, I would like to use a formula where when a 1 is typed into one cell, a 1 also appears in another cell.
Example, type 1 into any of cells A1, A2, A3, or A4, and a 1 will also appear in cell A5.

I am not sure if this is called conditional formatting but I don't think it is very complex. I am still new to working with formulas other than =sum(). I am excited to learn other forumlas so thank you for the helP!

Solved, thank you!