回文数字

import java.util.Scanner;


public class Main {
	static char []str2 = new char [10];
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		boolean flag = false;
		for (int i = 10000 ; i < 1000000 ; i++) {
			String str1 = String.valueOf(i);
			str2 = str1.toCharArray();
			if(i < 100000 && str2[0] == str2[4] && str2[1] == str2[3])
			{
				int sum = (str2[0] - ‘0‘) + (str2[1] - ‘0‘) + (str2[2] - ‘0‘) + (str2[3] - ‘0‘) + (str2[4] - ‘0‘);
				if(sum == n)
				{
					System.out.println(i);
					flag=true;
				}	
			}
			else if(i >= 100000 && str2[0] == str2[5] && str2[1] == str2[4] && str2[2] == str2[3])
			{
				int sum = (str2[0] - ‘0‘) + (str2[1] - ‘0‘) + (str2[2] - ‘0‘) + (str2[3] - ‘0‘) + (str2[4] - ‘0‘) + (str2[5] - ‘0‘);
				if(sum == n)
				{
					System.out.println(i);
					flag=true;
				}
			}
		}
		if(flag==false)
			System.out.println("-1");
	}

}