백준 2231번(Java)

import java.io.*;

public class Main {

	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

		int N = Integer.parseInt(br.readLine());
		int result = 0;

		for(int i=0; i<N; i++) {
			int num = i;
			int sum = 0;
			
			while(num != 0) {
				sum += num % 10;
				num /= 10;
			}
			
			if(sum+i == N) {
				result = i;
				break;
			}
		}

		bw.write(String.valueOf(result));

		br.close();
		bw.flush();
		bw.close();
	}
}