#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: huanglingkai
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/