#include<bits/stdc++.h>
using namespace std;
int main(){
	long long n,cnt=0,b=0;
	cin>>n;
	for(int i=1;i<=n;i++){
		if(i%3==2&&i%5==3&&i%7==2){
			cnt++;
		}
	}
	if(cnt>0){
		cout<<cnt<<endl;
	} 
	else{
		cout<<0<<endl;
	}
	return 0;
}
/**************************************************************
	Problem: 1055
	User: xuanhua
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/