char s[9];f(u,i,j,k,a,p,q){for(i=a=0;p=s[j=i];++i)for(;q=s[k=++j];)for(;s[++k];)u>>i&p>48&u>>j&p!=q&u>>k&q==s[k]?a=fmax(a,p*100+q*11-5328+f(u^1<<i^1<<j^1<<k)):0;return a;}x;main(){x=!printf("%d",f(~!gets(s)));}