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

/**************************************************************
	Problem: 1055
	User: zzz1
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/