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