#include<iostream>
#include<vector>
#include<set>
#include<tuple>

using namespace std;
string N;
vector<tuple<int, int, int>> chiwa[13];
int used[13];

int c(int i, int j, int k){

   return (100*(N[i]-'0')+10*(N[j]-'0')+N[k]-'0');
}

int rec(int x){

   if(x==N.size()) return 0;
   int s=0;
   s=max(s, rec(x+1));
   for(auto y: chiwa[x]){
      int i, j, k;
      tie(i, j, k)=y;
      if(used[i]||used[j]||used[k]) continue;
      used[i]=used[j]=used[k]=1;
      s=max(s, rec(x+1)+c(i, j, k));
      used[i]=used[j]=used[k]=0;
   }

   return s;
}

int main(){

   cin>> N;
   for(int i=0; i<N.size(); i++){
      for(int j=i+1; j<N.size(); j++){
         for(int k=j+1; k<N.size(); k++){
            int c=N[i]-'0', w1=N[j]-'0', w2=N[k]-'0';
            if(c==0||c==w1||c==w2||w1!=w2) continue;
            chiwa[i].push_back(make_tuple(i, j, k));
         }
      }
   }

   cout<< rec(0)<< endl;

   return 0;
}