#include <iostream>
#include <algorithm>
#include <string>
#include <vector>

int solve(std::string s, std::vector<bool> used, int score) {
    int max_score = score;
    for (int i = 0; i < s.length(); i++) {
        for (int j = i + 1; j < s.length(); j++) {
            for (int k = j + 1; k < s.length(); k++) {
                if (s[i] != '0' && s[j] == s[k] && s[i] != s[j]) {
                    if (!used[i] && !used[j] && !used[k]) {
                        used[i] = used[j] = used[k] = true;
                        max_score = std::max(solve(s, used, score + ((s[i] - '0') * 100 + (s[j] - '0') * 10+ (s[k] - '0'))), max_score);
                        used[i] = used[j] = used[k] = false;
                    }
                }
            }
        }
    }
    return max_score;
}

int main() {
    std::string s;

    std::cin >> s;

    std::vector<bool> used(s.length(), false);
    
    std::cout << solve(s, used, 0) << std::endl;
    
    return 0;
}