#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,i=1,g=0;
	cin>>n;
		while(i<=n){
			if(i%3==2&&i%5==3&&i%7==2) g++;
			i++;
		}
		cout<<g;
    return 0;
}
/**************************************************************
	Problem: 1055
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/