#define _CRT_SECURE_NO_WARNINGS
#include<sstream>
#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<climits>
#include<cmath>
#include<string>
#include<vector>
#include<set>
#include<map>
#include<queue>
#include<numeric>
#include<functional>
#include<algorithm>
#include<bitset>
#include<tuple>
#include<unordered_set>
#include<random>
using namespace std;
#define INF (1<<29)
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define all(v) v.begin(),v.end()
#define uniq(v) v.erase(unique(all(v)),v.end())


int dp[1 << 13];

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	string s;
	cin >> s;
	rep(b, 1 << s.size()) {
		rep(k, s.size())if ((b >> k & 1) == 0) {
			rep(j, k)if ((b >> j & 1) == 0) {
				rep(i, j)if ((b >> i & 1) == 0) {
					if (s[i] != '0' && s[i] != s[j] && s[j] == s[k]) {
						dp[b | 1 << i | 1 << j | 1 << k] =
							max(dp[b | 1 << i | 1 << j | 1 << k], dp[b] + (s[i] - '0') * 100 + (s[j] - '0') * 11);
					}
				}
			}
		}
	}

	cout << *max_element(dp, dp + (1 << s.size())) << endl;

	return 0;
}