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