#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c;
    cin>>a;
    if(a>=10){
    	c=3*25;
        b=(c*5+119)/120;
    }
    if(a>=7&&a<10){
    	c=3*15;
        b=(c*5+119)/120;
    }
    if(a>=3&&a<=6){
    	c=3*5;
        b=(c*5+119)/120;
    }
    cout<<b;
}
/**************************************************************
	Problem: 1310
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/