#include<bits/stdc++.h> 
using namespace std;
int main(){
	int n,s=0;
	cin>>n;
	while(n>=1){
	   if(n%3==2&&n%5==3&&n%7==2){
	   	s++;	
	   } 
	   n--;
	   
	   }
	cout<<s;
	return 0;
}
/**************************************************************
	Problem: 1055
	User: zhangchenhao
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/