import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static String solve(String s) {
        //  Return the sum of S(A) modulo 10^9+7.
        int a[]=new int [s.length()];
        for(int i=0;i<s.length();i++)
            a[i]=s.charAt(i)-48;
        int j=0,max=0;
        String B="";
        for(int k=0;k<a.length;k++)
        {
            //max=0;
            for(int i=0;i<a.length-k;i++)
            {
                j=i+k;
                //System.out.println(i+" "+j);
                max=0;
                for(int l=i;l<=j;l++)
                    if(a[l]>=max)
                        max=a[l];
                B=""+max+B;
            }
        }
        //System.out.println(B);
        return B;
            
    }
    static int sum (String s)
    {
        int sum=0;
        for(int i=0;i<s.length();i++)
            sum += s.charAt(i)-48;
        //System.out.println(sum);
        return sum;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] a = new int[n];
        for(int a_i = 0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }
        String s="";
        for(int a_i = 0; a_i < n; a_i++){
            s+=a[a_i];
        }
        int result = sum(solve(solve(s)));
        System.out.println(result);
        in.close();
    }
}