#include<bits/stdc++.h>
#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
int n,s=0;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        if(i%3==2 and i%5==3 and i%7==2)
        {
            s++;
        }
    }
    
    cout<<s<<endl;
    return 0;
}