#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,m;
	cin>>a;
	if(a>10) m=25*3*5;
	else if(a>=7) m=15*3*5;
	else m=5*3*5;
	if(m%120==0)cout<<m/120;
	else cout<<m/120+1; 
	return 0;
	}

/**************************************************************
	Problem: 1310
	User: ljl2
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/