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


/**************************************************************
	Problem: 1055
	User: 15159808820
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/