The cell reference d$17 is an example of a

The cell reference D$17 is an example of an "anchored or an absolute reference." It means that the row or cell or column is anchored. When you try to copy excel formulas, it will copy the cells referred in that formula relative to the position where they are being copied to.

Kpa - known-plaintext attack

You should either take it to a phone repair shop or try and fix it yourself, look at wiki hows on fixing your phone from water damage.