N = int(input())
A=list(map(int,input().split()))
A.sort(reverse=True)


Beki = 2
cnt  = 0
ans  = 0

for i in range(N):
    if i<Beki-1:
        ans += A[i]*cnt
    else:
        Beki *= 2
        cnt  += 1
        ans  += A[i]*cnt
print(ans)