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: In the figure below, all corner angles are right angles and each number represents the unit-length of the segment which is nearest to it. How many square units of area does the figure have?

[asy]

draw((0,0)--(12,0)--(12,5)--(8,5)--(8,4)--(5,4)
--(5,6)--(0,6)--(0,0));

label("6",(0,3),W);
label("5",(2.5,6),N);
label("2",(5,5),W);
label("3",(6.5,4),S);
label("1",(8,4.5),E);
label("4",(10,5),N);

[/asy]
user