#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,c=1,h=0;
    cin>>n;
    while(c<=n){
    	if(c%3==2&&c%5==3&&c%7==2){
    	h++;
        }c++;
    }
    cout<<h;
}
/**************************************************************
	Problem: 1055
	User: xuezihong1
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/