#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;

vector<int> prime_dice={2,3,5,7,11,13};
vector<int> comp_dice={4,6,8,9,10,12};

int main(){
    int K;
    cin>>K;
    double ans=0;
    for(int i:prime_dice){
        for(int j:comp_dice){
            if(i*j==K){
                ans++;
            }
        }
    }
    cout<<ans/36<<endl;
}