#include<cstdio>
#include <iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>

#define mod 1000000007;

using namespace std;
typedef long long ll;
typedef pair<ll, ll> Pr;

string N;
int I[13];

 int main()
 {
	 cin >> N;

	 ll ans = 0;
	 int a_i, a_j, a_k;
	 for (int n = 0; n < 4; n++) {
		 ll res = 0;
		 for (int i = 0; i < N.size(); i++) {
			 for (int j = i + 1; j < N.size(); j++) {
				 for (int k = j + 1; k < N.size(); k++) {
					 string s = "";
					 s += N[i], s += N[j], s += N[k];
					 if (N[j] != N[k])continue;
					 if (res < stoll(s) && I[i] == 0 && I[j] == 0 && I[k] == 0) {
						 a_i = i, a_j = j, a_k = k;
						 res = stoll(s);
					 }
				 }
			 }
		 }
		 if (res != 0) {
			 I[a_i] = 1, I[a_j] = 1, I[a_k] = 1;
			 ans += res;
		 }
	 }
	 cout << ans << endl;
	return 0;
}