#include <iostream>
using namespace std;
int main(){
	int n,i,a;
	a=0;
	cin>>n;
	for(i=1;i<=n;i++){
		if(i%3==2&&i%5==3&&i%7==2){
		a++;	
		}
		
	}
	cout<<a<<endl;
}
/**************************************************************
	Problem: 1055
	User: admin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/