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

/**************************************************************
	Problem: 1055
	User: zhengzihao3
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/