#include<bits/stdc++.h>
using namespace std;
int main(){
	float a;
	int n,h,x;
	cin>>n;
	if(n>10) h=25;
	if(n<10&&n>6) h=15;
	else h=5;
	a=h*3*5;
	
	cout<<ceil(a/120.0);
	return 0;
}

/**************************************************************
	Problem: 1310
	User: tangkaixuan
	Language: C++
	Result: Wrong Answer
****************************************************************/