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


}

/**************************************************************
	Problem: 1055
	User: hongjiaming
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/