#!/bin/python3

import sys


n = int(input().strip())
calories = list(map(int, input().strip().split(' ')))
# your code goes here
miles = 0
cupcakes_eaten = 0
calories.sort(reverse = True)
for c in calories:
    miles = miles + (c * 2**cupcakes_eaten)
    cupcakes_eaten += 1

print(miles)