import sys
input=lambda: sys.stdin.readline().rstrip()
n,p=map(int,input().split())
pf={}

for i in range(2,int(p**0.5)+1):
  while p%i==0:
    pf[i]=pf.get(i,0)+1
    p//=i
if p>1:
  pf[p]=1

def primes(n):
  is_prime=[True]*(n+1)
  is_prime[0]=False
  is_prime[1]=False
  for i in range(2,int(n**0.5)+1):
    if not is_prime[i]:
      continue
    for j in range(i*2,n+1,i):
      is_prime[j]=False
  return [i for i in range(n+1) if is_prime[i]]

P=primes(n)
PF=set(pf.keys())
p_min=min(PF)
while True:
	for pp in P:
		if p_min*pp<=n:
			PF.add(pp)
	if min(PF)==p_min:
		break
	else:
		p_min=min(PF)

Chk=[0]*n
for i in range(n):
	if Chk[i]==1:
		continue
	else:
		if i+1 in PF:
			Chk[i]=1
			mul=2
			while mul*(i+1)<=n:
				Chk[mul*(i+1)-1]=1
				mul+=1
print(sum(Chk))