from typing import List


def next_positive_power_of_2(x: int) -> int:
    if x < 1:
        return 1

    return 1 << (x - 1).bit_length()


def get_power_of_2_num_tokens_buckets(max_num_tokens) -> List[int]:
    max_num_tokens = next_positive_power_of_2(max_num_tokens)
    num_token_buckets = []
    m = 1
    while m <= max_num_tokens:
        num_token_buckets.append(m)
        m *= 2

    return num_token_buckets