import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.PriorityQueue;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final char[] chs = sc.next().toCharArray();
		final int len = chs.length;
		final int size = 1 << len;
		
		int[] cost = new int[size];
		
		for(int bit = 0; bit < size; bit++){
			for(int i = 0; i < len; i++){
				if((bit & (1 << i)) != 0){ continue; }
				if(chs[i] == '0'){ continue; }
				
				for(int j = i + 1; j < len; j++){
					if((bit & (1 << j)) != 0){ continue; }
					if(chs[j] == chs[i]){ continue; }
					
					for(int k = j + 1; k < len; k++){
						if((bit & (1 << k)) != 0){ continue;}
						if(chs[k] != chs[j]){ continue; }
						
						final int next_bit = bit | (1 << i) | (1 << j) | (1 << k);
						final int next_cost = (chs[i] - '0') * 100 + (chs[j] - '0') * 10 + (chs[k] - '0');
						
						cost[next_bit] = Math.max(cost[next_bit], cost[bit] + next_cost);
					}
				}
			}
		}
		
		System.out.println(Arrays.stream(cost).max().getAsInt());
	}

}