#define _USE_MATH_DEFINES

#include <iostream>
#include <iomanip>

#include <algorithm>
#include <cmath>

#include <string>
#include <list>
#include <queue>
#include <vector>
#include <complex>
#include <set>

/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
    std::cin.tie(0); 
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed;//
    //cout << setprecision(6);//
	
	int K;
	cin>>K;
	LD E[27];
	for(int i=0;i<6;++i){
		E[K+i] = 0.0;
	}
	for(int i=K-1;i>=0;--i){
		E[i] = E[i+1]+E[i+2]+E[i+3]+E[i+4]+E[i+5]+E[i+6]+6;
		E[i] /= 6.0;
	}
	P(E[0]);
	return 0;
}