#include<bits/stdc++.h>
using namespace std;
int main(){
	int n=0,c=0,b=1;
	cin>>n;
	while(b<=n){
		if(b%3==2 and b%5==3 and b%7==2){
			c++;
			b++;
		}else{
			b++;
		}
		   
	}
    cout<<c;
}
/**************************************************************
	Problem: 1055
	User: lvrenxiang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/