#include <algorithm>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <sstream>
#include <functional>
#include <map>
#include <string>
#include <cstring>
#include <vector>
#include <queue>
#include <stack>
#include <deque>
#include <set>
#include <list>
#include <numeric>
using namespace std;
const double PI = 3.14159265358979323846;
const double EPS = 1e-12;
const int INF = 1<<25;
typedef pair<int,int> P;
typedef long long ll;
typedef unsigned long long ull;

string s;
int n;
int dp[1<<13];

int rec(int m){
	int &res = dp[m];
	if(dp[m]>=0) return res;
	res = 0;
	for(int i = 0; i < n; i++){
		if((m>>i)&1) continue;
		if(s[i]=='0') continue;
		int a = 100*(s[i]-'0');
		for(int j = i+1; j < n; j++){
			if((m>>j)&1) continue;
			if(s[i]==s[j]) continue;
			int b = 11*(s[j]-'0');
			for(int k = j+1; k < n; k++){
				if((m>>k)&1) continue;
				if(s[j]!=s[k]) continue;
				res = max(res, a+b+rec(m|(1<<i)|(1<<j)|(1<<k)));
			}
		}
	}
	return res;
}

int main(){
	memset(dp, -1, sizeof(dp));
	cin>>s;
	n = s.size();
	cout<<rec(0)<<endl;
	return 0;
}