# N=int(input())
# if N<=0:print(0)
# else:
#     print(N//100)

n=int(input())
ls=list(map(int,input().split()))
ls.sort()

ans=0

i=0
while len(ls)>0:
    a=2**i
    # print(i,ls)
    while a>0:
        # print(ls,i,a)
        if len(ls)==0:
            break
        ans+=ls.pop()*i
        a-=1
    else:
        i+=1

print(ans)