n = int(input())
a = list(map(int, input().split()))
a.sort(reverse=True)
t = 1
p = 0
idx = 0
ans = 0
while 1:
    if idx >= n:
        break
    for i in range(idx, min(idx + t, n)):
        ans += a[i] * p
    idx += t
    p += 1
    t *= 2
print(ans)