#include <bits/stdc++.h>
using namespace std;

#define _p(...) (void)printf(__VA_ARGS__)
#define forr(x,arr) for(auto&& x:arr)
#define _overload3(_1,_2,_3,name,...) name
#define _rep2(i,n) _rep3(i,0,n)
#define _rep3(i,a,b) for(int i=int(a);i<int(b);++i)
#define rep(...) _overload3(__VA_ARGS__,_rep3,_rep2,)(__VA_ARGS__)
#define _rrep2(i,n) _rrep3(i,0,n)
#define _rrep3(i,a,b) for(int i=int(b)-1;i>=int(a);i--)
#define rrep(...) _overload3(__VA_ARGS__,_rrep3,_rrep2,)(__VA_ARGS__)
#define all(x) (x).begin(), (x).end()
#define bit(n) (1LL<<(n))
#define sz(x) ((int)(x).size())
#define fst first
#define snd second
using ll=long long;using pii=pair<int,int>;using vb=vector<bool>;
using vi=vector<int>;using vvi=vector<vi>;using vvvi=vector<vvi>;
using vl=vector<ll>;using vvl=vector<vl>;using vvvl=vector<vvl>;
using vd=vector<double>;using vvd=vector<vd>;using vvvd=vector<vvd>;
using vpii=vector<pii>;using vvpii=vector<vpii>;using vvvpii=vector<vvpii>;
template <typename T> T read() {T t; cin >> t; return t;}

template<class T> bool amax(T &a, const T &b) { if (a < b) { a = b; return 1; } return 0; }

void Main() {
  string s;
  cin >> s;
  int n = sz(s);

  map<int, int> c3;

  int k = 3;
  int comb = (1 << k) - 1;
  while (comb < 1 << n) {
    vi ds;
    rep(i, n) {
      if (comb & bit(i)) {
        ds.push_back(s[i]-'0');
      }
    }
    if (ds[0] != 0 && ds[1] == ds[2] && ds[0] != ds[1]) {
      c3[comb] = ds[0] * 100 + ds[1] * 10 + ds[2];
      //_p("%d:%d\n", comb, c3[comb]);
    }
    int x = comb & -comb, y = comb + x;
    comb = ((comb & ~y) / x >> 1) | y;
  }

  vi dp(bit(n));
  rep(i, bit(n)) {
    if (c3.count(i)) dp[i] = c3[i];
  }

  rep(i, bit(n)) if (dp[i]) {
    forr(ccw, c3) {
      if ((i & ccw.fst) == 0) {
        amax(dp[i|ccw.fst], dp[i] + ccw.snd);
      }
    }
  }

  int ans = *max_element(all(dp));
  cout << ans << endl;
}
int main() { cin.tie(nullptr); ios::sync_with_stdio(false); Main(); return 0; }