import java.io.*;
import java.util.*;


public class Main_yukicoder437_1 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		String s = sc.next();

		pr.println(max(s));
	}

	private static int max(String s) {
		char[] ss = s.toCharArray();
		int n = s.length();

		int max = 0;
		for (int i = 0; i < n; i++) {
			for (int j = i + 1; j < n; j++) {
				for (int k = j + 1; k < n; k++) {
					if (ss[i] != '0' && ss[i] != ss[j] && ss[j] == ss[k]) {
						StringBuilder tmp = new StringBuilder();
						tmp.append(ss[i]).append(ss[j]).append(ss[k]);
						int itmp = Integer.parseInt(tmp.toString());
						StringBuilder stmp = new StringBuilder(s);
						stmp.deleteCharAt(k);
						stmp.deleteCharAt(j);
						stmp.deleteCharAt(i);
						max = Math.max(max, itmp + max(stmp.toString()));
					}
				}
			}
		}

		return max;
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}