M=3500001
d=[0]*M
for i in range(2,M):
 if d[i]<1:
  for j in range((M-1)//i+1):
   d[i*j]=i
N=int(input())
a=0
for i in range(1,N+1):
 c=0
 k=set()
 while i>1:
  k.add(d[i])
  i//=d[i]
  c+=1
 a+=c==4==len(k)
print(a)