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



print(ans)