#!/bin/python3

import sys

def solve(a):
    #  Return the sum of S(S(A)) modulo 10^9+7.
    b = list()
    n = len(a)
    for k in range(n):
        for i in range(n-k):
            j = i+k
            b.append(max(a[i:j+1]))
    return b

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