N = int(input())
A = list(map(int,input().split()))
S = [2**k for k in range(N+1)]
A.sort(reverse=True)
i,j,ans = 0,0,0
for s in S:
    cnt = 0
    while cnt < s and j < N:
        ans += i*A[j]
        j += 1
        cnt += 1
    i += 1

print(ans)