How to increase value of variable after second loop? (I'm a Beginner) : I am making a for loop for my robot. Basically, I want to robot to move one more row that the one before it after each loop. I want to start at how many rows the user wants eventually keep going. So if the user wants 4 row to begin with, it'll start off moving 4 rows, then it'll move for 5 rows, then it'll move for 6 rows, etc.  
I used variable makeLine and put it as makeLine++ so it would increase each time by one. However, when I do this it starts off at 5 instead of 4 each time.
How do I make sure it starts off at the value the user inputted but also go up by 1 after that

Sorry if this is a stupid question I'm a beginner lol