def get_fl_from_id(members):
    """Get number of FLNC reads from read ids."""
    assert isinstance(members, list)
    # ex: 13cycle_1Mag1Diff|i0HQ_SIRV_1d1m|c139597/f1p0/178
    try:
        return sum(int(_id.split('/')[1].split('p')[0][1:]) for _id in members)
    except (IndexError, ValueError):
        raise ValueError("Could not get FL num from %s" % members)