import sys
input = sys.stdin.readline
from collections import *

n = int(input())
A = list(map(int, input().split()))
A.sort(reverse=True)
ans = 0
k = 0
cap = 1

for Ai in A:
    ans += k*Ai
    cap -= 1
    
    if cap==0:
        k += 1
        cap = 1<<k

print(ans)