#include<iostream>
#include<cstdio>
#include<cstring>
#include <cstdlib>  
#include <cmath>   
#include<cctype>
#include<string>
#include<set>
#include <map>
#include<algorithm>
#include <functional>
#include<vector>
#include<climits>
#include<stack>
#include<queue>
#include <deque>
#include <climits>
#include <typeinfo>
#include <utility> 
#define all(x) (x).begin(),(x).end()
#define rep(i,m,n) for(int i = m;i < n;++i)
#define pb push_back
#define fore(i,a) for(auto &i:a)
#define rrep(i,m,n) for(int i = m;i >= n;--i)
#define INF INT_MAX/2
using namespace std;
using ll = long long;
using R = double;
const ll MOD = 1e9 + 7;
const ll inf = 1LL << 50;
struct edge { ll from; ll to; ll cost; };

string n;
map<set<int>, int>m;

int dfs(set<int>s,int sum) {
	if (m.find(s) != m.end())return m[s];

	int ans = sum;
	rep(i, 0, n.size())rep(j, i + 1, n.size())rep(k, j + 1, n.size()) {
		if (n[i] != '0' && n[i] != n[j] && n[j] == n[k]) {
			if (s.count(i) == 0 && s.count(j) == 0 && s.count(k) == 0) {
				int num = 100 * (n[i] - '0') + 10 * (n[j] - '0') + (n[k] - '0');
				set<int>tmp = s;
				tmp.insert(i), tmp.insert(j), tmp.insert(k);
				ans = max(dfs(tmp,sum+num),ans);
			}
		}
	}
	return m[s] = ans;
}

int main(){
	cin >> n;
	set<int>s;
	cout << dfs(s, 0) << endl;
	return 0;
}