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

public class Solution {

   	static List<Integer> b ;
	static int solve(int[] A) {

		b = new ArrayList<>();

		int SA_T[] = getSA(A);

		b = new ArrayList<>();

		int SSA_T[] = getSA(SA_T);

		return Arrays.stream(SSA_T).sum();
	}

	private static int[] getSA(int[] a) {

		int lenA = a.length;

		for(int k = 0; k < lenA; k++){

			for(int i = 0; i < lenA - k; i++){

				int j = i + k;
				if(i==j){
					b.add(a[i]);
				}else{
					OptionalInt max =  Arrays.stream(Arrays.copyOfRange(a, i, j+1)).max();
					b.add(max.getAsInt());
				}
			}

		}

		return b.stream().mapToInt(Integer::intValue).toArray();
	}


    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();
    }
}