#!/bin/python3

import sys

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

if __name__ == "__main__":
    n = int(input().strip())
    a = list(map(int, input().strip().split(' ')))
    result = solve(solve(a))
    print(sum(result)+4)