#include<bits/stdc++.h>
using namespace std;
int o,l,z;
int main(){
	cin>>o;
	if(o>=3&&o<7) l=5;
	if(o>6&&o<11) l=15;
	if(o>10) l=25;
	z=l*3*5;
	cout<<(z-1)/120+1;
	return 0;
}
/**************************************************************
	Problem: 1310
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/