#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,g=1,a=0;
    cin>>n;
    while(g<=n){
    	if(g%3==2&&g%5==3&&g%7==2){
    		a=a+1;
    	}
    	g++;
    }cout<<a;
return 0;
}

/**************************************************************
	Problem: 1055
	User: chenzelin
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/