#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,m;
    cin>>n;
    if(n>10) m=25*3*5;
    else if(n>=7) m=15*3*5;
         else m=5*3*5;
    if(m%120==0) cout<<m/120;
    else cout<<m/120+1;           
    return 0;
}
/**************************************************************
	Problem: 1310
	User: lijinkai
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/