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

/**************************************************************
	Problem: 1055
	User: ljl2
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/