#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n;
    cin >>n;
    if (n==3)
        cout <<"0.5";
    else if (n>10 && n<15)
        cout <<"0";
    else
        cout <<"1";
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}