Please help on hitting probabilities, I can't remember how to do this basic stuff.

Markov chain have states 1-4 has one-step transition matrix

$\displaystyle \left(\begin{array}{ccccc}\frac{1}{8}&\frac{1}{8}& \frac{1}{8}&\frac{1}{8}&\frac{1}{8}\\0&\frac{3}{4} &0&0&\frac{1}{4}\\0&0&\frac{1}{2}&0&0\\\frac{1}{2} &0&0&0&0\\0&\frac{1}{2}&0&0&\frac{1}{2}\end{array} \right)$

For each state $\displaystyle i$, find

$\displaystyle a_i = P$(process ever reaches K = {2,5}$\displaystyle | X_0 = i)$

Thank you