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

}

cout<<s; 
	return 0;
}

/**************************************************************
	Problem: 1055
	User: zy002
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/