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

/**************************************************************
	Problem: 1055
	User: zhuangsongyu
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/