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

/**************************************************************
	Problem: 1055
	User: fzy001
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/