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