13. (10 points) In the equation below, $A, B, C, D, E, F, G, H, I$ each represent different digits from $1 \sim 9$.
$$
\overline{\mathrm{ABCD}}+\overline{\mathrm{EF}} \times \overline{\mathrm{GH}}-I=X
$$

Then the minimum value of $X$ is . $\qquad$
【Solution】Solution: According to the problem, $I=9$, we now consider the minimum value of $\overline{\mathrm{ABCD}}+\overline{\mathrm{EF}} \times \overline{\mathrm{GH}}$.
In $\overline{\mathrm{ABCD}}$, $A=1$, in $\overline{\mathrm{EF}} \times \overline{\mathrm{GH}}$, $E=2$, $G=3$, the minimum value of $\overline{\mathrm{EF}} \times \overline{\mathrm{GH}}$ is $25 \times 36=900$, the minimum value of $\overline{\mathrm{ABCD}}+\overline{\mathrm{EF}} \times \overline{\mathrm{GH}}$ is $1478+900=2378$,

Therefore, the minimum value of $X$ is $2378-9=2369$,