#include <bits/stdc++.h>
using namespace std;
int main(){
   int n,h,s;
   cin>>n;
   h=n*1000+n;
	{
    s=h/7/11/13;
   	}  
   cout<<s<<endl;
}
/**************************************************************
	Problem: 1961
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/