from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    N = int(input())
    A = list(map(int, input().split()))

    A.sort(reverse=1)
    prev = 0
    f = []
    for k in range(20):
        i = 2 ** k
        if prev + i > N:
            break
        f.append(A[prev : prev + i])
        prev = i

    ans = 0
    for k, a in enumerate(f):
        ans += sum(map(lambda x: x * k, a))
    print(ans)


main()