#include <iostream>
#include <string>
#include <string.h>
using namespace std;
int getValue(string &S,int x,int y,int z)
{
	string S1;
	S1=S[x];
	S1+=S[y];
	S1+=S[z];
	S.erase(z,1);
	S.erase(y,1);
	S.erase(x,1);
	return atol(S1.c_str());
}
bool Check(string S,int x,int y,int z)
{
	if (S[y]==S[z]){
		return true;
	}else{
		return false;
	}
}

int deal(string &S)
{
	int i,j,k;
	int sLen=S.length();
	int value=0;
	for (i=0;i<sLen-2;i++){
		for (j=i+1;j<sLen-1;j++){
			for (k=j+1;k<sLen;k++){
				if (S[j]==S[k]){
					value=+getValue(S,i,j,k);
					return value;
				}
			}
		}
	}
	return 0;
}
int main(int argc, char* argv[])
{
	string N,N1;
	int maxScore=0;
	cin>>N;
	int nLen=N.length();
	if (nLen<=2){
		cout<<0<<endl;
		return 0;
	}
	int i;
	for (i=0;i<nLen-2;i++){
		string n=N.c_str()+i;
		int score=0;
		while (n.length()>0){
			int value=deal(n);
			if (value>0){
				score+=value;
			}else{
				break;
			}
		}
		if (maxScore<score){
			maxScore=score;
		}
	}
	cout<<maxScore<<endl;
	return 0;
}