#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,i=1,c=0;
    cin>>n;
    while(i<=n)
    {
    if(i%3==2&&i%5==3&&i%7==2)
    {
        c++;
    }
    	i++;
    }
    cout<<c;
	return 0;
}
/**************************************************************
	Problem: 1055
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:18 ms
	Memory:2072 kb
****************************************************************/