#!/bin/python3

import sys

def solve(A):
    #  Return the sum of S(S(A)) modulo 10^9+7.
    B = []
    for k in range(0,len(A)):
        for i in range(0,len(A)-k):
            j = i + k
            t = A[i:j+1]
            B.append(max(t))
    return solve2(B)

def solve2(A):
    #  Return the sum of S(S(A)) modulo 10^9+7.
    C = []
    for k in range(0,len(A)):
        for i in range(0,len(A)-k):
            j = i + k
            t = A[i:j+1]
            C.append(max(t))
    return sum(C)
     

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