#!/bin/python3

import sys


n = int(input().strip())
c = list(map(int, input().strip().split(' ')))
sum1 = 0
# your code goes here
ind = 0
c = [int(i) for i in c]
c.sort(reverse=True)
for i in c:
    sum1 = sum1 + (pow(2,ind)*i)
    ind = ind + 1
print(sum1)