#include<bits/stdc++.h>
using namespace std;
int main(){
	int m;
	float n;
	cin>>m;
	
	if(m>=3&&m<=6){
	n=5*5*3/120.0;
	cout<<ceil(n);
	} else if (m>=7&&m<=10){
	n=15*5*3/120.0;
	cout<<ceil(n);
	}
	else if(m>10){
	n=25*5*3/120.0;
	cout<<ceil(n);}
	
	
	
	
	
	return 0;
	
	
	
	
	
	}
/**************************************************************
	Problem: 1310
	User: zhangchenhao
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/