#include<iostream>
using namespace std;
int main(){
	int a=1,n,i=0;
	cin>>n;
	for(a=1;a<=n;a++){
		if(a%3==2&&a%5==3&&a%7==2){
			i++;
		}
	}
	cout<<i;
}
/**************************************************************
	Problem: 1055
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/