I am a beginner, and I was working on a simple credit program. I want it to work so every time I add an input of a number it gets stored in a variable that shows my total balance. The problem right now is that the program is only a one use program so the input i enter does not get saved into a variable so that when I enter another value it gets added onto a previous input. Code is below:

```
Purchase = int(input("How much was your purchase? "))

credit_balance = 0

credit_limit = 2000

Total = credit_balance + Purchase

print("Your account value right now: ", Total)

if Total == credit_limit:
    print("You have reached your credit limit!", Total)

```