#define max(p,q)p<q?p=q:0
char s[99];
ans;

f(sum,used){
int i,j,k,newsum;
for(i=0;s[i];i++){if(used>>i&1||s[i]=='0')continue;
for(j=i+1;s[j];j++){if(used>>j&1||s[i]==s[j])continue;
for(k=j+1;s[k];k++){if(used>>k&1||s[j]!=s[k])continue;
newsum=sum+(s[i]-'0')*100+(s[j]-'0')*10+s[k]-'0';
max(ans,newsum);
f(newsum,used^1<<i^1<<j^1<<k);
}}}
}

main(){
gets(s);
f(0,0);
printf("%d",ans);
return 0;
}