n,k=map(int,input().split())
d={k:1}
for i in range(1,n+1):
  e={}
  for j in d:
    r=j//i
    if r==0:continue
    if r in e:e[r]+=d[j]
    else:e[r]=d[j]
  for j in e:
    if j in d:d[j]+=e[j]
    else:d[j]=e[j]
print(sum(d.values())-1)