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

public class Solution {

    static int solve(int[] A) {
        //  Return the sum of S(S(A)) modulo 10^9+7.
         List<Integer> arr = ans(A);
        int[] array = arr.stream().mapToInt(i->i).toArray();
        List<Integer> arr1=ans(array);
        int[] array1 = arr1.stream().mapToInt(i->i).toArray();
        int answer = sums(array1);
        return answer;
        
    }
    static int sums(int[] arrays)
    {
        int sum=0;
        int l = arrays.length;
        for(int i =0;i< l;i++)
        {
           sum+=arrays[i]; 
        }
        return sum;
    }
    static List<Integer> ans(int[] A)
    {
        int len = A.length;
        int k,j=0,i,v;
        List<Integer> b = new ArrayList<Integer>();
        for(k = 0; k <= len-1;k++)
        {
           for(i = 0; i <= len-k-1;i++)
            {
               j = i+k;
               v = max(i,j,A);
                b.add(v);   
            } 
          
        }
       
        return b;
    }
    static int max(int i,int j,int[] A)
    {
        int max1 = 0;
       for(int a = i;a <= j; a++)
       {
           if(A[a]>max1)
           {
               max1 = A[a];
           }
       }
        return max1;
    }
        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();
        }
        int result = solve(a);
         
        System.out.println(result);
        in.close();
    }
}