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

/**************************************************************
	Problem: 1055
	User: tonghuawei
	Language: C++
	Result: Wrong Answer
****************************************************************/