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

public class Solution {

    static int solve(int[] A) {
        //  Return the sum of S(S(A)) modulo 10^9+7.
        List<Integer> B = Arrays.stream(A).boxed().collect(Collectors.toList()); 
        for(int j = 0; j < 2; j++){
            List<Integer> temp = new ArrayList<Integer>(B);
            for(int k = 0; k < (B.size() - 1); k++){
                for(int i = 0; i < (B.size() - k - 1); i++){
                    int l = i + k;
                    int max = Collections.max(B.subList(i, l+2));
                    temp.add(max);
                }
            }
            B = temp;
        }
        
        Integer integerSum = B.stream().mapToInt(Integer::intValue).sum();
        return integerSum;
    }

    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();
    }
}