#include <iostream>
using namespace std;

int main()
{
	int n;
	cin >> n;
	if (n>=3 && n<=6)
	{
		if (n%120 == 0)
		{cout<< (3*5*5)/120;}
		else
		{cout<< (3*5*5)/120+1;}
	}
	else if (n>=7 && n<=10)
	{
		if (n%120 == 0)
		{cout<< (3*15*5)/120;}
		else
		{cout<< (3*15*5)/120+1;}
		
	}
	else
	{
		if (n%120 == 0)
		{cout<< (3*25*5)/120;}
		else
		{cout<< (3*25*5)/120+1;}
	}
}
/**************************************************************
	Problem: 1310
	User: xiaomingze
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/