#!/bin/python

import sys

def solve(a):
    b=[]
    for k in range(0,len(a)):
        for i in range(0,len(a)-k):
            j=i+k
            b.append(max(a[i:j+1]))
    return b

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