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