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 regular pentagon $ABCDE$, diagonal $AC$ is drawn, as shown. Given that each interior angle of a regular pentagon measures 108 degrees, what is the measure of angle $CAB$?

[asy]
size(4cm,4cm);
defaultpen(linewidth(1pt)+fontsize(10pt));

pair A,B,C,D,E;
A = (0,0);
B = dir(108);
C = B+dir(39);
D = C+dir(-39);
E = (1,0);

draw(A--B--C--D--E--cycle,linewidth(1));
draw(A--C,linewidth(1)+linetype("0 4"));

label("A",A,S);
label("B",B,W);
label("C",C,N);
label("D",D,E);
label("E",E,S);
label("$108^\circ$",B,E);;
[/asy]
user