#!/bin/python3

import sys



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

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