#include <bits/stdc++.h>

using namespace std;

#define fst(t) std::get<0>(t)
#define snd(t) std::get<1>(t)
#define thd(t) std::get<2>(t)

using ll = long long;
using P = std::tuple<int,int>;

const int dx[8] = {-1, 1, 0, 0, -1, -1, 1, 1}, dy[8] = {0, 0, -1, 1, -1, 1, -1, 1};

string S;
int dp[1 << 15];

int rec(int status){
    if(dp[status] != -1){return dp[status];}
    
    int l = S.size(), res = 0;
    for(int i=0;i<l;++i){
        for(int j=i+1;j<l;++j){
            for(int k=j+1;k<l;++k){
                if((status >> i & 1) ||
                   (status >> j & 1) ||
                   (status >> k & 1) ||
                   S[i] == '0' ||
                   S[j] != S[k] ||
                   S[i] == S[j]){
                    continue;
                }

                res = max(res, 100 * (S[i]-'0') + 11 * (S[j]-'0') + rec(status | (1 << i) | (1 << j) | (1 << k)));
            }
        }
    }

    return dp[status] = res;
}

int main(){
    //*
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);
    /*/
      /*/

    std::cin >> S;

    memset(dp, -1, sizeof(dp));
    std::cout << rec(0) << std::endl;
}