/*
    Author:zeke
    
    pass System Test!
    GET AC!!
*/
#include <iostream>
#include <queue>
#include <vector>
#include <iostream>
#include <vector>
#include <string>
#include <cassert>
#include <algorithm>
#include <functional>
#include <cmath>
#include <queue>
#include <set>
#include <stack>
#include <deque>
#include <map>
#include <iomanip>
#include <utility>
#include <stack>
#include <bitset>
using ll = long long;
using ld = long double;
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(), (x).end()
#define rep3(var, min, max) for (ll(var) = (min); (var) < (max); ++(var))
#define repi3(var, min, max) for (ll(var) = (max)-1; (var) + 1 > (min); --(var))
#define Mp(a, b) make_pair((a), (b))
#define F first
#define S second
#define Icin(s) \
    ll(s);      \
    cin >> (s);
#define Scin(s) \
    ll(s);      \
    cin >> (s);
template <class T>
bool chmax(T &a, const T &b)
{
    if (a < b)
    {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
bool chmin(T &a, const T &b)
{
    if (b < a)
    {
        a = b;
        return 1;
    }
    return 0;
}
typedef pair<ll, ll> P;
typedef vector<ll> V;
typedef vector<V> VV;
typedef vector<P> VP;
ll mod = 1e9 + 7;
ll MOD = 1e9 + 7;
ll INF = 1e18;

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    vector<vector<ld>> dp(1e6 + 1, vector<ld>(7));
    dp[0][0] = 1.0;
    rep3(i, 1, 1e6 + 1)
    {
        for (ld j = 1; j < 7; j++)
        {
            ld k = (6 - (j - 1)) / 6;
            ld k2=j/6;
            dp[i][j] += dp[i - 1][j]*k2;
            //  cout<<dp[i][j]<<endl;
            dp[i][j] += dp[i - 1][j - 1] * k;
        }
    }
    ll n;
    cin >> n;
  /*  rep(i,10){
        rep(j,7)cout<<dp[i][j]<<" ";
        cout<<endl;
    }*/
    // cout<<dp[6][6]<<endl;
    cout << setprecision(10) << dp[n][6] << endl;
    // cout<<"hello"<<endl;
}