N=int(input())
A=sorted(list(map(int,input().split())),reverse=True)
now=0
ans=0
while 2**(now+1)-1<=N:
  for i in range(2**now-1,2**(now+1)-1):
    ans+=A[i]*now
  now+=1
for i in range(2**now-1,N):
  ans+=A[i]*now
print(ans)