#include <iostream>
#include <cstdio>
#include <vector>
#include <cmath>
#include <cstring>
#include <numeric>
#include <algorithm>
#include <functional>
#include <array>
#include <map>
#include <queue>
#include <limits.h>
#include <set>
#include <stack>
#include <random>
#define rep(i,s,n) for(int i = (s); (n) > i; i++)
#define REP(i,n) rep(i,0,n)
#define RANGE(x,a,b) ((a) <= (x) && (x) <= (b))
#define POWT(x) ((x)*(x))
#define ALL(x) (x).begin(), (x).end()
#define MODI 10000
#define bitcheck(a,b)   ((a >> b) & 1)
#define bitset(a,b)      ( a |= (1 << b))
#define bitunset(a,b)    (a &= ~(1 << b))
using namespace std;
typedef pair<int, int> pii;
typedef long long ll;

int func(string str) {
	int ret = 0;
	int len = str.length();

	REP(i, len) {
		rep(j, i + 1, len) {
			rep(k, j + 1, len) {
				if (str[i] != '0' && (str[i] != str[j] )&& (str[j] == str[k])) {
					string ns(str);
					ns.erase(ns.begin() + k);
					ns.erase(ns.begin() + j);
					ns.erase(ns.begin() + i);
					int can = (str[i] - '0') * 100 + (str[j] - '0') * 10 + (str[k] - '0');
					ret = max(ret, can + func(ns));
				}
			}
		}
	}

	return ret;
}

signed main() {
	char str [13];
	scanf("%s", str);
	int ans = func(str);
	printf("%d\n", ans);
	return 0;
}