2. Let the function $f(x)$ defined on the set of integers satisfy
$$
f(n)=\left\{\begin{array}{ll}
n-5 & n \geqslant 2000 \\
f[f(n+8)] & n<2000
\end{array} \text {, then } f(1993)=\right.
$$
$\qquad$ .
1997;