#include <iostream>
using namespace std;

int main(){
	int n,m,p;
	cin>>n;
	if(n >= 10){
		m = 25 * 3 * 5;	
	}else if(n >= 7){
		m = 15 * 3 * 5;
	}else if(n >= 3){
		m = 5 * 3 * 5;	
	}
	if(m % 120 == 0){
		p = m / 120;
	}else{
		p = m / 120 + 1;
	}
	cout<<p<<endl;
	return 0;
}
/**************************************************************
	Problem: 1310
	User: admin
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/