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: What is the least number of colors needed to shade the tessellation shown, such that no two tiles sharing a side are the same color?

[asy]
draw((-8,-2)--(8,-2));
draw((-8,2)--(8,2));
draw((-8,6)--(8,6));
draw((-8,10)--(8,10));
draw((-8,14)--(8,14));
path a=(-8,14)--(-6.5,12)--(-10,8)--(-6.5,4)--(-10,0)--(-8,-2);
draw(a);
draw(shift((4,0))*a);
draw(shift((8,0))*a);
draw(shift((12,0))*a);
draw(shift((16,0))*a);
[/asy]
user