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










 
/**************************************************************
	Problem: 1055
	User: zhuangwenya
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/