#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
#define pb push_back
int dy[]={0, 0, 1, -1, 1, 1, -1, -1};
int dx[]={1, -1, 0, 0, 1, -1, -1, 1};

#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define mp make_pair
#define fi first
#define sc second
int n;
double memo[2000000];
bool done[2000000];
double p[]={0.0,0.083333333333333,0.166666666666667,0.250000000000000,0.083333333333333,0.250000000000000,0.166666666666667};
double saiki(int x){
    if(done[x])
        return memo[x];
    done[x] = true;
    if(x >= n)
        return memo[x] = 0.0;
    double sum = 1.0;
    FOR(i,1,7)
        sum += saiki(x + i) * p[i];
    return memo[x] = sum;
}
int main(){
    int t;
    scanf("%d",&t);
    REP(i,t){
        scanf("%d",&n);
        REP(j,n + 10)
            done[j] = false;
        printf("%0.10lf\n",saiki(0));
    }
    return 0;
}