Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: I am playing a walking game with myself.  On move 1, I do nothing, but on move $n$ where $2 \le n \le 25$, I take one step forward if $n$ is prime and two steps backwards if the number is composite.  After all 25 moves, I stop and walk back to my original starting point.  How many steps long is my walk back?
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