#include <iostream>
#include <string>
using namespace std;

int ans=0;

void search(string s,int sum){
  int ss=s.size();
  if(ss<3) {
    if(ans<sum) ans=sum;
    return;
  }
  for(int i=0;i<ss-2;++i){
    for(int j=i+1;j<ss-1;++j){
      for(int k=j+1;k<ss;++k){
        if(s[i] != '0' && s[i] != s[j] && s[j] == s[k]){
          string s2=s;
          int sum2=sum;
          string s3;
          s3+=s2[i];
          s3+=s2[j];
          s3+=s2[k];
          int a=stoi(s3);
          s2.erase(i,1);
          s2.erase(j-1,1);
          s2.erase(k-2,1);
          sum2+=a;
          search(s2,sum2);
        } else {
          if(ans<sum) ans=sum;
        }
      }
    }
  }
}

int main(){
  string s;
  cin>>s;
  search(s,0);
  cout<<ans<<endl;
}