#include <bits/stdc++.h> 
using namespace std;
int main(){
	int n,a,b,c,x,z;
	cin>>n;
	a=n/100;
	b=n/10%10;
	c=n%10;
	x=n+c*1000+b*10000+a*100000;
	z=x/7/11/13;
	cout<<z;
}
/**************************************************************
	Problem: 1961
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/