def main():
    n = int(input())
    arr = sorted(list(map(int, input().split())), reverse=True)

    kmax = 0
    while 2 ** kmax - 1 < n:
        kmax += 1

    pow2 = []
    for k in range(kmax + 1):
        pow2 += [k] * (1 << k)

    ans = 0
    for a, p in zip(arr, pow2):
        ans += a * p
    print(ans)


if __name__ == "__main__":
    main()