#include <bits/stdc++.h>
using namespace std;
int main(){
 	int h=0,n,i=1;
	cin>>n;
	while(i<=n){
		if(i%3==2&&i%5==3&&i%7==2){
		h++;
		}
	i++;
	}
	 
	cout<<h;
	
}
/**************************************************************
	Problem: 1055
	User: zhangyilei
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/