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

}
/**************************************************************
	Problem: 1055
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/