#!/bin/python3

import sys

def solve(A):
    #  Return the sum of S(S(A)) modulo 10^9+7.
    B = maxTransform(A)
    sumofSofB = 0
    for k in range(len(B)):
        for i in range(len(B)-k):
            j = i + k
            sumofSofB += sorted(B[i:j+1])[-1]
    return sumofSofB
    
def maxTransform(A):
    B = []
    for k in range(len(A)):
        for i in range(len(A)-k):
            j = i + k
            B.append(sorted(A[i:j+1])[-1])
    return B

if __name__ == "__main__":
    n = int(input().strip())
    a = list(map(int, input().strip().split(' ')))
    result = solve(a)
    print(result)