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

i++;
}cout<<s;
	return 0;
}

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