N=int(input())
A=list(map(int, input().split()))
A=sorted(A)[::-1]
now=-1
ans=0
g=0
r=0
cost=0
for i in range(N):
  ans+=A[i]*cost
  if i==g:
    r+=1
    g+=pow(2,r)
    cost+=1
print(ans)