#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>

using namespace std;

int cww(char a, char b, char c) {
	if (a != 0 && a != b && b == c) {
		return (a - '0') * 100 + (b - '0') * 10 + (c - '0');
	} else {
		return -1;
	}
}

int calc_score(string s, int score) {
	int n = s.size();
	if (n < 3) {
		return score;
	}

	int ret = score;

	for (int i = 0; i < n; i++) {
	for (int j = i+1; j < n; j++) {
	for (int k = j+1; k < n; k++) {
		int point = cww(s[i], s[j], s[k]);
		if (point == -1) {
			continue;
		}

		auto t = s;
		t.erase(k, 1);
		t.erase(j, 1);
		t.erase(i, 1);

		int x = calc_score(t, score + point);
		ret = max(ret, x);
	}}}

	return ret;
}

int main() {
	string s;
	cin >> s;

	cout << calc_score(s, 0) << endl;
	return 0;
}