knots=[]
r=[3,4,5]
for i in r:
  knots += HTLinkExteriors(knots_vs_links="knots", crossings=i)
vols = []   
for k in knots:
  v=k.volume();
  if v<1:
    v = 0;
vols.append(v)
print(len(knots)-len(set(vols)))