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: Wei has designed a logo for his new company using circles and a large square, as shown.  Each circle is tangent to two sides of the square and its two adjacent circles.  If he wishes to create a version of this logo that is 20 inches on each side, how many square inches will be shaded?

[asy]
size(100);
draw((0,0)--(4,0)--(4,4)--(0,4)--cycle);
fill((0,0)--(4,0)--(4,4)--(0,4)--cycle,grey);
draw(circle((1,1),1)); draw(circle((3,1),1)); draw(circle((1,3),1)); draw(circle((3,3),1));
fill(circle((1,1),1),white); fill(circle((3,1),1),white); fill(circle((1,3),1),white); fill(circle((3,3),1),white);
[/asy]
user