package no437;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		int n = s.length();
		boolean[] isCWW = new boolean[1000];
		for(int i=100;i<1000;i++) {
			isCWW[i] = i % 111 != 0 && i % 100 % 11 == 0;
		}
		int[] x = new int[n];
		for(int i=0;i<n;i++) {
			x[i] = s.charAt(i) - '0';
		}
		int[] dp = new int[1<<n];
		for(int m=0;m<1<<n;m++) {
			for(int i=0;i<n;i++) {
				if ((m >> i & 1) == 1) continue;
				for(int j=i+1;j<n;j++) {
					if ((m >> j & 1) == 1) continue;
					for(int k=j+1;k<n;k++) {
						if ((m >> k & 1) == 1) continue;
						int a = x[i] * 100 + x[j] * 10 + x[k];
						if (!isCWW[a]) continue;
						int nm = m | (1 << i) | (1 << j) | (1 << k);
						dp[nm] = Math.max(dp[nm], dp[m] + a);
					}
				}
			}
		}
		int max = 0;
		for(int i=0;i<1<<n;i++) {
			max = Math.max(max, dp[i]);
		}
		System.out.println(max);
	}
}