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

/**************************************************************
	Problem: 1055
	User: czr
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/