#!/bin/python3
#121:7
import sys


n = int(input().strip())
calories = list(map(int, input().strip().split(' ')))
# your code goes here
c = sorted(calories, key = int, reverse = True)
sum=0
for i in range(len(c)):
    sum+=c[i]*(2**i)
    #print(c[i])
print(sum)