def get_active_users(network_sp_users, active_users_perc, area_km2):
    """
    Estimate the number of active users.

    """

    active_users = round(
        network_sp_users *
        # (smartphone_users_perc/100) *
        (active_users_perc/100) /
        area_km2
    )

    return active_users