#include<bits/stdc++.h>

using namespace std;

struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;

template<typename T>
istream& operator>>(istream &is,vector<T> &v){
    for(auto &it:v)is>>it;
    return is;
}
template<typename T>void chmin(T& a, T& b){a=min(a,b);}
template<typename T>void chmax(T& a, T b){a=max(a,b);}

typedef long long LL;
LL calc(char a,char b,char c){
    if(a=='0')return 0;
    if(b!=c||a==b)return 0;
    return (a-'0')*100+(b-'0')*10+(c-'0');
}
int main(){
    string S;
    cin>>S;
    int n=S.size();
    LL res=0;
    vector<LL> dp(1<<n,0);
    vector<int> ord(1<<n,0);
    iota(ord.begin(),ord.end(),0);
    sort(ord.begin(),ord.end(),[&](int l,int r){
            return __builtin_popcount(l)>__builtin_popcount(r);});
    for(auto &bit:ord){
        chmax(res,dp[bit]);
        for(int i=0;i<n;i++)
            if(bit&(1<<i))
                for(int j=i+1;j<n;j++)
                    if(bit&(1<<j))
                        for(int k=j+1;k<n;k++)
                            if(bit&(1<<k)){
                                chmax(dp[bit-(1<<i)-(1<<j)-(1<<k)],dp[bit]+calc(S[i],S[j],S[k]));
                            }
                                          
    }
    cout<<res<<endl;
    return 0;
}