n = int(input())
A = list(map(int, input().split()))

A.sort(reverse=True)

ans = 0

num = 0
lim = 1
cnt = 0
for i in range(n):
    ans += A[i] * num
    cnt += 1
    if cnt == lim:
        cnt = 0
        lim *= 2
        num += 1
    # print(i, cnt, lim, num, ans)
print(ans)