#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,k;
	cin>>a;
	k=a*1001/7/13/11;
	cout<<k;
}
/**************************************************************
	Problem: 1961
	User: tonghuawei
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/