#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define MT make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define rt return
using dbl = double;
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<ll>;

dbl dp[1 << 6];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(20);

    int N; cin >> N;

    FOR(S, 1, 1 << 6) {
        
        int x = 0;
        rep(i, 6)x += S >> i & 1;
        
        if (x > N) {
            dp[S] = 0;
            continue;
        }
        int T = S;
        do {
            // ここでsubに対する処理
            dp[S] -= dp[T];
            T = (T - 1) & S;
        } while (T != S);

        dp[S] += pow(x / 6.0, N);
    }

    cout << dp[(1 << 6) - 1] << endl;
}