#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
using namespace std;
typedef pair<int,int> P;
int memo[1<<13];
int a[13];

int main(){
    int64_t N;
    int L=0;
    cin>>N;
    while(N){
        a[L++]=N%10;
        N/=10;
    }
    int comb=(1<<3)-1;
    int ans=0;
    vector<int> V3;
    while(comb<(1<<L)){
        int CWW[3],cww=0;
        for(int i=0;i<L;i++){
            if(comb&(1<<i))CWW[cww++]=a[i];
        }
        if(CWW[0]==CWW[1]&&CWW[1]!=CWW[2]&&CWW[2]){
            memo[comb]=CWW[2]*100+CWW[1]*10+CWW[0];
            ans=max(ans,memo[comb]);
            V3.push_back(comb);
        }
        int x = comb&-comb, y=comb+x;
        comb=((comb&~y)/x>>1)|y;
    }
    vector<int> V6;
    for(int i=0;i<V3.size();i++){
        for(int j=i+1;j<V3.size();j++){
            int v3i=V3[i],v3j=V3[j];
            if(v3i&v3j) continue;
            int sum=memo[v3i]+memo[v3j];
            memo[v3i|v3j]=max(memo[v3i|v3j],sum);
            V6.push_back(v3i|v3j);
            ans=max(ans,sum);
        }
    }
    vector<int> V9;
    for(auto v3:V3){
        for(auto v6:V6){
            if(v3&v6) continue;
            int sum=memo[v3]+memo[v6];
            memo[v3|v6]=max(memo[v3|v6],sum);
            V9.push_back(v3|v6);
            ans=max(sum,ans);
        }
    }
    if(L>=12){
        for(auto v3:V3){
            for(auto v9:V9){
                if(v3&v9)continue;
                int sum=memo[v3]+memo[v9];
                memo[v3|v9]=max(memo[v3|v9],sum);
                ans=max(sum,ans);
            }
        }
    }
    cout<<ans<<endl;
    return 0;
}