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

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