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: Bob rolls a fair six-sided die each morning. If Bob rolls a composite number, he eats sweetened cereal. If he rolls a prime number, he eats unsweetened cereal. If he rolls a 1, then he rolls again. In a non-leap year, what is the expected value of the difference between the number of days Bob eats unsweetened cereal and the number of days he eats sweetened cereal? [asy]
import olympiad; import geometry; size(50);

defaultpen(linewidth(0.8));
draw(unitsquare);
draw((0,1)--(0.5,1.5)--(1.5,1.5)--(1.5,0.5)--(1,0)^^(1.5,1.5)--(1,1));
dot((0.3,0.2)); dot((0.7,0.2));
dot((0.3,0.5)); dot((0.7,0.5));
dot((0.3,0.8)); dot((0.7,0.8));
dot((1.125,0.375)); dot((1.25,0.75)); dot((1.375,1.125));
dot((0.5,0.5/3 + 1)); dot((1.0,4/3));
[/asy]
user