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

/**************************************************************
	Problem: 1055
	User: sf751616
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/