#include<bits/stdc++.h>
using namespace std;
int main()
{
  int a=1,n,s=0;
  cin>>n;
  while(a<=n){
  
  if(a%3==2&&a%5==3&&a%7==2) s++;
  a++;
  }
  cout<<s;
return 0;
}





/**************************************************************
	Problem: 1055
	User: 078899
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/