n=int(input())
A=list(map(int,input().split()))
A.sort(reverse=True)
ans=0
cnt=0
N=n
for i in range(17):
  a=min(pow(2,i),N)
  for j in range(a):
    ans+=i*A[cnt]
    cnt+=1
  N-=a
  if N<=0:
    break
print(ans)