i=1
s=0
n=int(input())
while i<=n:
  a=i//1000
  b=i//100%10
  c=i//10%10
  d=i%10
  if i%3==2 and i%5==3 and i%7==2:
    s+=1
  i+=1
print(s)
/**************************************************************
	Problem: 1055
	User: admin
	Language: Python
	Result: Accepted
	Time:88 ms
	Memory:34480 kb
****************************************************************/