백준 10단계 no.2

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        int ger = 1;
        while (ger != n) {
            int sum = 0;
            int digit = ger;
            int bound = (int) Math.log10(digit);

            for (int i = 0; i <= bound; i++) {
                sum += digit % 10;
                digit /= 10;
            }
            sum += ger;
            if (sum == n) {
                break;
            }
            ger++;
        }

        if (ger != n) {
            System.out.println(ger);
        } else {
            System.out.println(0);
        }

    }
}