#include <iostream>
using namespace std;
int main(){
    int n,i,a;
    a=0;
    cin>>n;
    for(i=1;i<=n;i++){
        if(i%3==2&&i%5==3&&i%7==2){
        a++;    
        }
         
    }
    cout<<a<<endl;
}
/**************************************************************
	Problem: 1055
	User: suziqian
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/