#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {

    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    string S;
    cin>>S;
    int N=S.size();
    vector<int> DP(1<<N,0);
    for(int bit=0;bit<(1<<N);bit++){
        for(int i=0;i<N;i++){
            if(bit&(1<<i))continue;
            DP[bit+(1<<i)]=max(DP[bit+(1<<i)],DP[bit]);
            for(int j=0;j<i;j++){
                if(bit&(1<<j))continue;
                if(S[i]!=S[j])continue;
                for(int k=0;k<j;k++){
                    if(bit&(1<<k))continue;
                    if(S[j]==S[k])continue;
                    if(S[k]=='0')continue;
                    int p=(S[k]-'0')*100+(S[i]-'0')*11;
                    int nbit=bit+(1<<i)+(1<<j)+(1<<k);
                    DP[nbit]=max(DP[nbit],DP[bit]+p);
                }
            }
        }
    }
    cout<<DP[(1<<N)-1]<<endl;
}