#include<iostream>
#include<vector>
#include<string>
#include<array>
#include<algorithm>
#include<list>
#include<cmath>
#include<iomanip>
#include<queue>
#include<functional>
#include<climits>
#include<iterator>
#include<unordered_set>
#include<unordered_map>
#include<map>
#include<set>

#include<typeinfo>
#include<numeric>
#include<complex>
#include<memory>
#include<fstream>
#include<chrono>
#include<random>
using namespace std;

const double pi=4*atan(1.0);

constexpr long long mod=static_cast<long long>(1e9+7);

using cWeightEdges=vector<vector<pair<int,int>>>;
using cEdges=vector<vector<int>>;

int main(){
	string str;
	cin>>str;

	long long ans=0;
	queue<tuple<int,long long,vector<bool>>> Q;
	Q.push(make_tuple(0,0,vector<bool>(str.size(),false)));
	while(!Q.empty()){
		auto now=Q.front();
		Q.pop();
		int index=get<0>(now);
		long long score=get<1>(now);
		vector<bool> vec=get<2>(now);

		if(str.size()<3 || index>(str.size()-3)){
			ans=max(ans,score);
		}
		else{
			if(!vec[index] && str[index]!='0'){
				for(int i=index+1;i<str.size();++i){
					for(int j=i+1;j<str.size();++j){
						if(str[i]==str[j] && str[index]!=str[i] && !vec[i] && !vec[j]){
							long long tmp=(str[index]-'0')*100+(str[i]-'0')*10+(str[j]-'0');
							vector<bool> a=vec;
							a[index]=true;
							a[i]=true;
							a[j]=true;
							Q.push(make_tuple(index+1,score+tmp,a));
						}
					}
				}
			}
			Q.push(make_tuple(index+1,score,vec));
		}
	}
	cout<<ans<<endl;
	//system("pause");
	return 0;
}