Let $\{X(t), t \ge 0\}$ be a pure birth process with rates $\lambda_k = k^2$, starting with $X(0) = 1$. Let $Y(t) = min(X(t), 3)$. Find out the mean of $\int_0^T Y(t)dt$, where $T$ is a random variable uniformly distributed on $[0, 1]$ and independent of the pure birth process.