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