#include<bits/stdc++.h> using namespace std; #define int long long #define rep(i,n) for(int i=0;i<(n);i++) #define pb push_back #define all(v) (v).begin(),(v).end() #define fi first #define se second typedef vector<int>vint; typedef pair<int,int>pint; typedef vector<pint>vpint; template<typename A,typename B>inline void chmin(A &a,B b){if(a>b)a=b;} template<typename A,typename B>inline void chmax(A &a,B b){if(a<b)a=b;} double dp[64]; double nex[64]; signed main(){ dp[0]=1; int N;cin>>N; rep(t,N){ memset(nex,0,sizeof(nex)); rep(i,64){ double tmp=dp[i]/6; for(int j=0;j<6;j++)nex[i|(1<<j)]+=tmp; } rep(i,64)dp[i]=nex[i]; } printf("%.20f\n",dp[63]); return 0; }