#include<bits/stdc++.h>
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;
}
/**************************************************************
	Problem: 1310
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/