#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,ans=0,a;
    cin>>n;
    for(int i=1;i<=n;i++){
        if(i%3==2&&i%5==3&&i%7==2) ans++;
    }
    cout<<ans;
}
/**************************************************************
	Problem: 1055
	User: wangchenyu
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/