Let \[f(x) = \begin{cases}
-x^2 - 1 &\text{if }x<0, \\
2&\text{if }0 \le x< 4, \\
\sqrt{x}&\text{if }x \ge 4.
\end{cases}
\]Find $f(\pi)$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Let \[f(x) = \begin{cases}
-x^2 - 1 &\text{if }x<0, \\
2&\text{if }0 \le x< 4, \\
\sqrt{x}&\text{if }x \ge 4.
\end{cases}
\]Find $f(\pi)$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2
Let \[f(x) = \begin{cases}
-x^2 - 1 &\text{if }x<0, \\
2&\text{if }0 \le x< 4, \\
\sqrt{x}&\text{if }x \ge 4.
\end{cases}
\]Find $f(\pi)$.
train