For loop + add something

[Matheus]

Nice, thanks! How do I do it more dynamic, instead of writing:

for r in range(3):

change it to more dynamic such as it counts the array inputs?

For instance;

for r in range(n):

Where n = the total in the array. Reason I want to do it is if the array is very long I do not need to count 1 by 1.