import math
n=int(input())
a=sorted(list(map(int,input().split())),reverse=True)
L=[[0 for _ in range(2**i)] for i in range(int(math.log(n,2))+1)]
for i in range(1,n+1):
    L[int(math.log(i,2))][i-2**int(math.log(i,2))]=a[i-1]
ans=0
for i in range(len(L)):
    ans+=sum(L[i])*i
print(ans)