#include <bits/stdc++.h>
using namespace std;
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define vv(type, c, m, n, i) vector<vector<type>> c(m, vector<type>(n, i))
#define rep(i,a,n) for(int i=(a), i##_len=(n); i<i##_len; ++i)
#define rrep(i,a,n) for(int i=(a), i##_len=(n); i>i##_len; --i)
#define len(x) ((int)(x).size())
#define mp make_pair
#define eb emplace_back
#define em emplace
#define fi first
#define se second
#define get(a, i) get<i>(a)
#define mt make_tuple
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<long long> vll;
typedef vector<string> vs;
typedef vector<bool> vb;
typedef pair<int, int> pii;
#define mini min_element
#define maxi max_element
#define sum(a, b) accumulate(a, b)
#define chmax(a,b) if(a<b)a=b
#define chmin(a,b) if(a>b)a=b
#define ce(x, y) (x + y - 1) / y
#define print(t) cout << (t) << "\n";
#define printk(v) rep(i, 0, len(v) - 1) { cout << v[i] << " "; } cout << v.back() << endl;
int v[20];
int ans = 0;
bool bo[20];
void w1(int i, int sum_c);
void w2(int a, int sum_c);
void c1(int a, int b, int sum_c);
void w1(int i, int sum_c) {
	rrep(a, i, 1) {
		if (!bo[a])
			w2(a, sum_c);
	}
}
void w2(int a, int sum_c) {
	rrep(b, a - 1, 0) {
		if (v[b] == v[a] && !bo[b])
			c1(a, b, sum_c);
	}
}
void c1(int a, int b, int sum_c) {
	rrep(c, b - 1, -1) {
		if (v[c] != 0 && v[c] != v[b] && !bo[c]) {
			int sum_z = sum_c + (v[c] * 100 + v[b] * 11);
			bo[a] = bo[b] = bo[c] = true;
			chmax(ans, sum_z);
			w1(a - 1, sum_z);
			bo[a] = bo[b] = bo[c] = false;
		}
	}
}
int main() {
	string s; cin >> s;
	int len_s = len(s);
	rep(i, 0, len_s) {
		v[i] = s[i] - '0';
	}
	rrep(i, len(s) - 1, 1) {
		w1(i, 0);
	}
	print(ans);
	return 0;
}