Meredith drives in a series of directions:

1. 5 miles to the northeast.
2. 15 miles to the southeast.
3. 25 miles to the southwest.
4. 35 miles to the northwest.
5. 20 miles to the northeast.

Calculate how many miles Meredith is from her starting point after completing her journey.

Let's think step by step and output the final answer within \boxed{}.
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