#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,m;
	cin>>n;
	if(n>10) m=25*3*5;
	else if(n>=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: ccf
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/