#include <bits/stdc++.h>
#include <ctime>
using namespace std;
typedef long long ll;
int main(){
    srand(time(0));
    ll n=1;
    ll count=0;
    ll poscount=0;
    for (ll t=0; t<20; t++){
        n*=10;
        for (ll i=0; i<n; i++)
        {
            set<ll> sett {0,1,2,3,4,5,6};
            bool au[7] {};
            bool b=false;
            if ((rand() % 10)>2)
                au[rand()%7]=true;
            ll h=rand()%7;
            sett.erase(h);
            for(auto&k:sett){
                if (au[k]){
                    b=true;
                    break;
                }
            }
            if (!b)
                if (au[h]){
                    poscount++;
                    count++;
                }
                else
                    count++;
        }
        //cout << poscount << ' ' << count;
        cout << (double)poscount*1.0/count << endl;
    }
    return 0;
}