n=int(input())
A=sorted(map(int,input().split()),reverse=True)
ans=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)