#include <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <algorithm>
#include <map>
#include <set>
#include <cstdio>
#include <cmath>
#define rep(i,l,n) for(lint i=l;i<n;i++)
#define rer(i,l,n) for(lint i=l;i<=n;i++)
#define all(a) a.begin(),a.end()
#define o(a) cout<<a<<endl
#define pb(a) push_back(a)
#define mk(a,b) make_pair(a,b)
#define fi first
#define se second
using namespace std;
typedef long long lint;
typedef vector<int> vi;
typedef vector<lint> vli;
typedef vector<vi> vvi;
typedef pair<int,int> pii;

int main(){
	int d[210]={};
	int s[6]={2,3,5,7,11,13};
	int g[6]={4,6,8,9,10,12};
	rep(i,0,6){
		rep(j,0,6){
			d[s[i]*g[j]]++;
		}
	}
	int k;
	cin>>k;
	double ans=(double)d[k]/36;
	printf("%.12lf\n",ans);
}