/* template.cpp {{{ */
#include <bits/stdc++.h>
using namespace std;
#define get_macro(a, b, c, d, name, ...) name
#define rep(...) get_macro(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define rrep(...) get_macro(__VA_ARGS__, rrep4, rrep3, rrep2, rrep1)(__VA_ARGS__)
#define rep1(n) rep2(i_, n)
#define rep2(i, n) rep3(i, 0, n)
#define rep3(i, a, b) rep4(i, a, b, 1)
#define rep4(i, a, b, s) for (ll i = (a); i < (ll)(b); i += (ll)(s))
#define rrep1(n) rrep2(i_, n)
#define rrep2(i, n) rrep3(i, 0, n)
#define rrep3(i, a, b) rrep4(i, a, b, 1)
#define rrep4(i, a, b, s) for (ll i = (ll)(b) - 1; i >= (ll)(a); i -= (ll)(s))
#define each(x, c) for (auto &&x : c)
#define fs first
#define sc second
#define all(c) begin(c), end(c)
using ui = unsigned;
using ll = long long;
using ul = unsigned long long;
using ld = long double;
const int inf = 1e9 + 10;
const ll inf_ll = 1e18 + 10;
const ll mod = 1e9 + 7;
const ll mod9 = 1e9 + 9;
const int dx[]{-1, 0, 1, 0, -1, 1, 1, -1};
const int dy[]{0, -1, 0, 1, -1, -1, 1, 1};
template<class T, class U> void chmin(T &x, const U &y){ x = min<T>(x, y); }
template<class T, class U> void chmax(T &x, const U &y){ x = max<T>(x, y); }
struct prepare_ { prepare_(){ cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(12); } } prepare__;
/* }}} */

int dp[1 << 13];

int main(){
  string s;
  cin >> s;
  int n = s.size();
  rep(b, 1 << n) rep(i, n) rep(j, i + 1, n) rep(k, j + 1, n){
    if (b >> i & 1) continue;
    if (b >> j & 1) continue;
    if (b >> k & 1) continue;
    if (s[i] == '0') continue;
    if (s[j] != s[k]) continue;
    if (s[i] == s[j]) continue;
    int x = (s[i] - '0') * 100 + (s[j] - '0') * 10 + (s[k] - '0');
    chmax(dp[b | (1 << i) | (1 << j) | (1 << k)], dp[b] + x);
  }
  int res = 0;
  rep(i, 1 << n) chmax(res, dp[i]);
  cout << res << endl;
}