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

     cout<<h;
}
/**************************************************************
	Problem: 1055
	User: chenyichuen
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/