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

template<class T1, class T2>
void chmax(T1 &a, T2 b) {
	if (a < b) a = b;
}

int main() {
	string s;
	cin >> s;
	int n = s.size();

	vector<int> dp(1 << n, -1e9);
	dp[0] = 0;

	for (int m = 0; m < 1 << n; m++) {
		for (int i = 0; i < n; i++) {
			for (int j = i + 1; j < n; j++) {
				for (int k = j + 1; k < n; k++) {
					if (m & 1 << i) continue;
					if (m & 1 << j) continue;
					if (m & 1 << k) continue;
					if (s[i] != s[j] && s[j] == s[k] && s[i] != '0') {
						chmax(dp[m | 1 << i | 1 << j | 1 << k], dp[m] + (s[i] - '0') * 100 + (s[j] - '0') * 10 + (s[k] - '0'));
					}
				}
			}
		}
	}

	cout << *max_element(dp.begin(), dp.end()) << endl;
}