package test;

import java.util.Arrays;
import java.util.Scanner;

public class No437 {
	void run() {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();

		System.out.println(max(s));
	}

	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 sb = new StringBuilder();
						sb.append(ss[i]).append(ss[j]).append(ss[k]);
						int t = Integer.parseInt(sb.toString());
						StringBuilder sb2 = new StringBuilder(s);
						sb2.deleteCharAt(k);
						sb2.deleteCharAt(j);
						sb2.deleteCharAt(i);
						max = Math.max(max, t+max(sb2.toString()));

					}
				}

			}
		}
		return max;
	}




	void debug(Object... o) {
		System.out.println(Arrays.deepToString(o));
	}

	public static void main(String[] args) {
		new No437().run();
	}
}