I dont have any drop down list elements, I get a number in the previous step, and now I want to subtract one from it and get a new number.
So if it is 19 in previous step i want to get 18.
The reason why I need this is I want to read the last line of the file.
ZP returns total number line from 1 to N
But when reading a line from a file ZP takes from 0 to N