def circle_radius(cs):
    """Compute the ``CS`` attribute into a circle radius in osu! pixels.

    Parameters
    ----------
    cs : float
        The circle size.

    Returns
    -------
    radius : float
        The radius in osu! pixels.
    """
    return 512 / 16 * (1 - 0.7 * (cs - 5) / 5)
