#include<bits/stdc++.h>
using namespace std;
int g;
int main(){
	int n,i=1;
	cin>>n;
	while(i<=n){
		if(i%3==2&&i%5==3&&i%7==2) g++;
		i++;
	}
	cout<<g;
	return 0;
}
/**************************************************************
	Problem: 1055
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/